{"product_id":"afr3640","title":"AFR 24 BBC Cylinder Head 290cc Oval Port fully CNC ported. 112cc chambers. Compe","description":"\u003cp\u003eAFR3640\u003c\/p\u003e\n\u003cdiv id=\"prod_info\"\u003e\n\u003csection class=\"section_style\"\u003e\n\u003cp\u003eAFR’s 290cc Oval Port heads feature 100% CNC ported intake, exhaust \u0026amp; chambers, A356 aluminum castings and high quality components throughout. Recommended for moderate street, or street\/strip builds with displacements up to 509 cubic inches, operating up to 6500 RPM. AFR heads are available bare (without parts), call our tech line for details.\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/290cc-bbc-oval-port-cylinder-head\/#faq\" class=\"prodlink\"\u003ePlease see footnotes for additional information.\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eTHESE PRODUCTS ARE ILLEGAL TO OPERATE ON ANY PUBLIC HIGHWAY. THIS MEANS ANY PUBLIC PAVED OR UNPAVED ROADWAY OR IN A PUBLIC PARK. THESE PRODUCTS ARE ONLY LEGAL IF USED ON A DEDICATED RACING VEHICLE. VIOLATION ARE SUBJECT TO A MAXIMUM PENALTY OF $37,500 PER VIOLATION PER VEHICLE, REVOCATION OF REGISTRATION BY DMV, LOSS OF USE ON PUBLIC RIGHT OF WAYS AND PROOF OF CORRECTION OF THE TAMPERING.\u003c\/p\u003e\n\u003ctable border=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth colspan=\"3\"\u003e290cc Aluminum BBC Cylinder Heads\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart #\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCombustion Chamber\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/cart.php?action=add\u0026amp;product_id=444\u0026amp;attribute%5B833%5D=298\" class=\"prodlink\"\u003e3640\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003eFully CNC Ported - Hydraulic Roller\u003c\/td\u003e\n\u003ctd\u003e112cc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/cart.php?action=add\u0026amp;product_id=444\u0026amp;attribute%5B833%5D=299\" class=\"prodlink\"\u003e3650\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003eFully CNC Ported - Solid Roller\u003c\/td\u003e\n\u003ctd\u003e112cc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp align=\"center\"\u003e\u003cspan\u003e\u003cstrong\u003eClick part # to add product to your cart\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable border=\"0\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"9\"\u003e290cc Competition Flow Chart\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e \u003c\/td\u003e\n\u003ctd\u003e.200\u003c\/td\u003e\n\u003ctd\u003e.300\u003c\/td\u003e\n\u003ctd\u003e.400\u003c\/td\u003e\n\u003ctd\u003e.500\u003c\/td\u003e\n\u003ctd\u003e.550\u003c\/td\u003e\n\u003ctd\u003e.600\u003c\/td\u003e\n\u003ctd\u003e.650\u003c\/td\u003e\n\u003ctd\u003e.700\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInt\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e159\u003c\/td\u003e\n\u003ctd\u003e233\u003c\/td\u003e\n\u003ctd\u003e289\u003c\/td\u003e\n\u003ctd\u003e327\u003c\/td\u003e\n\u003ctd\u003e339\u003c\/td\u003e\n\u003ctd\u003e354\u003c\/td\u003e\n\u003ctd\u003e362\u003c\/td\u003e\n\u003ctd\u003e369\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eExh\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e135\u003c\/td\u003e\n\u003ctd\u003e180\u003c\/td\u003e\n\u003ctd\u003e230\u003c\/td\u003e\n\u003ctd\u003e262\u003c\/td\u003e\n\u003ctd\u003e271\u003c\/td\u003e\n\u003ctd\u003e278\u003c\/td\u003e\n\u003ctd\u003e286\u003c\/td\u003e\n\u003ctd\u003e292\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp align=\"center\"\u003eTest conducted at 28\" of water (pressure) on Superflow 600\u003cbr\u003eBore Size: 4.310\", intake 3\/4\" radius plate exhaust, 1 7\/8\" curved pipe\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e\n\u003csection id=\"included\" class=\"section_style\"\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"descrip\" colspan=\"2\"\u003e\u003cstrong\u003eIncluded Components\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd colspan=\"2\"\u003e\u003cstrong\u003e100% CNC Ported Combustion Chambers\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd colspan=\"2\"\u003e\u003cstrong\u003e100% CNC Ported Exhaust Ports\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd colspan=\"2\"\u003e\u003cstrong\u003e100% CNC Ported Intake Ports\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd colspan=\"2\"\u003e\u003cstrong\u003eCompetition 5-angle Valve Job\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003e11\/32\" Intake Valve, 2.250\" x 5.500\" O.A.L\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/afr-7620-bbc-11-32-intake-valve-2-250-x-5-500-oal\" class=\"prodlink\"\u003eAFR #7620\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003e11\/32\" Nail Head Exhaust Valve, 1.880\" x 5.450\" Overall Valve Length\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/afr-7630-bbc-11-32-nail-head-exhaust-valve-1-880-x-5-450-oal\" class=\"prodlink\"\u003eAFR #7630\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003ePAC Racing Springs 1.550” OD Solid Roller Dual Valve Drag Race Spring, 220 lbs. on seat, .710” maximum lift, - 260* max recommended duration, Max RPM 7200-7400 (upgrades available)\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/afr-8000-1-550-od-solid-roller\" class=\"prodlink\"\u003eAFR #8000\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003ePAC Racing #1940 1.550” OD Hydraulic Roller Dual Valve Spring, 175 lbs. on seat, .725” maximum lift, Max RPM 6500-6700\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/afr-8002-1-550-od-hydraulic-roller\" class=\"prodlink\"\u003eAFR #8002\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003e10° Steel Retainers 1.500\" O.D x 1.120\"I.D x .705\" I.D\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/afr-8511-10-steel-retainer-1-500-od-x-1-120-id-x-705-id\" class=\"prodlink\"\u003eAFR #8511\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003e10° 11\/32\" Valve Keepers with lashcap recess\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/afr-9005-10-valve-locks-11-32\" class=\"prodlink\"\u003eAFR #9005\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eARP 7\/16\" Rocker Studs Intake\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/afr-6407-arp-7-16-rocker-stud-for-bbc-intake-bbf\" class=\"prodlink\"\u003eAFR #6407\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eARP 7\/16\" Rocker Studs Exhaust\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/afr-6406-arp-7-16-rocker-stud-for-bbc-exhaust\" class=\"prodlink\"\u003eAFR #6406\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eAdjustable 3\/8\" Guide Plates\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/afr-6109-bbc-adjustable-guide-plate\" class=\"prodlink\"\u003eAFR #6109\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003e11\/32\" Viton Valve Seals\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/afr-6613-bbc-valve-seal\" class=\"prodlink\"\u003eAFR #6613\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eHardened Valve Spring I.D Locator 1.550\" O.D x .705\" I.D - For 8000 Spring\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/afr-8048-id-spring-seat-1-550-od-x-780-od-x-570-id\" class=\"prodlink\"\u003eAFR #8048\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eHardened Valve Spring I.D Locator 1.655\" O.D x 1.565\" I.D – For 8002 Spring\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/afr-8044-od-spring-cup-1-655-od-x-1-565-id-x-570-id\" class=\"prodlink\"\u003eAFR#8044\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eIntake Valve Seats 2.450\" O.D x 1.950\" I.D x .375\" Deep\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/afr-9065-bbc-oval-bbf-2-450-od-intake-valve-seat\" class=\"prodlink\"\u003eAFR #9065\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eExhaust Valve Seats 2.000\" O.D x 1.580\" I.D x .375\" Deep\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/afr-9064-bbc-exhaust-seat-2-000-od\" class=\"prodlink\"\u003eAFR #9064\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003e11\/32\" Intake Bronze Valve Guides .502\" O.D x 2.10\" O.A.L\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/afr-9041-bbc-intake-guide\" class=\"prodlink\"\u003eAFR #9041\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003e11\/32\" Exhaust Bronze Valve Guides .502\" O.D x 2.25\" O.A.L\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/afr-9042-bbc-exhaust-bbf-guide\" class=\"prodlink\"\u003eAFR #9042\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/section\u003e\n\u003csection id=\"recommended\" class=\"section_style\"\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"descrip\" colspan=\"2\"\u003e\u003cstrong\u003eRecommended Components:\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eIntake Port Gasket\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/afr-6863-bbc-oval-port-intake-gasket\" class=\"prodlink\"\u003eAFR #6863\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cstrong\u003eImportant\u003c\/strong\u003e: Do not use your AFR gasket as a template to port match your intake manifold as one AFR gasket is used for many AFR runner volumes.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eExhaust Port Gasket\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/afr-6858-bbc-exhaust-gasket\" class=\"prodlink\"\u003eAFR #6858\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eHead Gasket\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003eFel-Pro #1047 (Mark V and VI) or\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/fel-pro-1047-mark-v-vi\" class=\"prodlink\"\u003eAFR #6849\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eHead Gasket\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003eFel-Pro #1017-1 (Mark IV) or\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/fel-pro-1017-1-mark-iv\" class=\"prodlink\"\u003eAFR #6850\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eHead Gasket\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003eFel-Pro #1047 (Mark V and VI) or\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/fel-pro-1047-mark-v-vi\" class=\"prodlink\"\u003eAFR #6849\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eHead Bolts\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003eARP 135-3703 (Mark IV) or\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/arp-135-3703-mark-iv\" class=\"prodlink\"\u003eAFR #6306\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eHead Bolts\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003eARP 135-3707 (Mark V) or\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/arp-135-3707-mark-v\" class=\"prodlink\"\u003eAFR #6308\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eHead Studs\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003eARP 235-4713 or\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/arp-235-4713-bbc-head-stud-kit\" class=\"prodlink\"\u003eAFR #6307\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eHead Bolt Washers\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003eManley,\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/afr-6320-head-bolt-washer-kit\" class=\"prodlink\"\u003eAFR #6320\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eStud Girdle, (AFR Specific)\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/afr-6202-bbc-stud-girdle-v2\" class=\"prodlink\"\u003eAFR #6202\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003e7\/16 Stud Mount Rocker Arms - 1.7 Ratio (For Optimized Geometry)\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/afr-bbc-7-16-rocker-arms-1-7-ratio\" class=\"prodlink\"\u003eAFR #6043\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003e1.7 Shaft Mount Rocker Arms T\u0026amp;D\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e\u003ca href=\"https:\/\/www.airflowresearch.com\/1-7-t-d-shaft-mount-for-bbc-magnum-heads\" class=\"prodlink\"\u003eAFR #6065\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eShaft Mount Rocker Arms\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003eCrower or Jesel Pro Series\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eSuggested Manifold\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003eVictor Jr\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eSuggested Manifold\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003eRPM Performer\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eSuggested Manifold\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003eAir Gap #7561\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eSpark Plug Starting Range\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003eAutolite 3924\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cstrong\u003eNote:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e1” longer head bolt needed on four bottom exhaust bolt holes.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/section\u003e\n\u003csection id=\"specs\" class=\"section_style\"\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"descrip\" colspan=\"2\"\u003e\u003cstrong\u003eSpecifications \u0026amp; Features:\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003eA356 Aluminum\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eIntake Port Volume\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e290cc\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eIntake Port Dimension\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e2.030\"H x 1.830\"W x1\/2 Radius\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eIntake Port Location\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003eStock\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eExhaust Port Volume\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e135cc\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eExhaust Port Dimension\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e1.770\"H x 2.010\" W\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eExhaust Port Location\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e.375\" Raised\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eCombustion Chamber Size(Full CNC)\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e112cc\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eValve Cover Bolt Pattern\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003ePerimeter Bolt\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eValve Angle\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e24°\/4° Int, 15°\/4° Exh\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eValve Spring Pocket Diameter\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e1.725\" O.D\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eMax Valve Spring Pocket Machining\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e1.750\" O.D\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eDeck Thickness\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e.750\"\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eMinimum Bore Diameter\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e4.250\"\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eFlat Mill\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e.006\" per cc\/ Maximum 102cc\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eAngle Mill\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e.009\" per cc\/ Maximum 97cc\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cstrong\u003eNote:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAngle mills might require a .120\" Thick intake gasket.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eMinimum Cross Sectional Area\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e2.895 sq. in.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd\u003eSpark Plug Dimensions\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv align=\"right\"\u003e14mm x .750\" w\/Gasket Seat\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"pib\"\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cstrong\u003eCARB Status:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eThis product is not legal for sale or use on emission-controlled vehicles and intended for dedicated race vehicles only.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2 class=\"descrip\" data-mce-fragment=\"1\"\u003eFootnotes\u003c\/h2\u003e\n\u003col class=\"a\" data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eAFR Big Block Chevy\u003c\/h3\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eWith some domed aftermarket pistons, it may be necessary to slightly clearance or modify the piston due to our more efficient heart shaped combustion chamber design. Most of the newer designed dome profiles will clear. AFR strongly recommends material be removed from the piston and not the cylinder head. Our combustion chamber shapes are very critical to flow and altering the cylinder head can adversely affect flow and power production. It is the customers responsibility to verify proper piston to head clearance.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eHeads are designed for 3\/8\" pushrods. Larger pushrods will not fit without clearancing and is not recommended since some areas are very thin. AFR recommends the use of .120\" thick-wall pushrods.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eFor ideal geometry and wipe pattern AFR strongly recommends AFR stud mount rockers part #6043 for applications below 7400 RPM and .790 lift. For applications above these limits shaft mount rockers are typically advised.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eGeneral Recommendations for AFR Cylinder Heads:\u003c\/h3\u003e\n\u003c\/li\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eBar Codes\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e- Please keep the bar code \u0026amp; paperwork shipped with your head, these contain all the specs for your heads when calling AFR.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eHigh Volume\/Pressure Oil Pumps\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e- If you are using a high volume or high pressure oil pump it can submerge the valve seals in oil causing smoking or oil consumption. Your block manufacturer or engine builder can recommend oil restrictions to the top end\/valve train components.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003ePushrods -\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003c\/strong\u003eDifferent length pushrods might be required, always check pushrod length. Check pushrod clearance with heads placed on the block before final assembly. Larger pushrods will not fit without clearancing and is not recommended since some areas are very thin. AFR recommends the use of .120\" thick-wall pushrods.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eMills\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e- Flat or angle mills could affect flow numbers and might require a thicker intake gasket.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eStud Girdles\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e- Due to many available factory OEM and aftermarket style\/variations your existing stud girdle may not fit (AFR heads require AFR Stud Girdles)\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eBoosted\/Nitrous Applications\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e- We strongly recommend considering Inconel exhaust valves and AFR's optional heavy duty intake valve for power adder applications. Since boosted or nitrous oxide applications accelerate RPM quickly, additional spring pressure is required. We strongly recommend upgrading your valve springs or increasing your valve spring pressures since boost pressure on the valve reduces spring tension. For example, 15lbs boost on a 2.125 OD valve reduces the springs closed seat pressure by approximately 40-45lbs.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eAll MARINE Applications\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e- We strongly recommend Inconel exhaust valves \u0026amp; also offer a hard anodized coating to slow the effects of corrosion. Please see note on guide clearance below.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Guide Clearance\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003c\/strong\u003e- Your AFR Heads come with proper guide clearance (.0012\"-.0016\") for most applications. Boosted\/Nitrous or marine applications might require additional clearance and it is the customer's responsibility to verify proper clearance in these applications.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Springs\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e- Forced induction, nitrous oxide and cams with aggressive ramp rates may require additional spring pressure. We offer optional valve springs for these types of applications. AFR also recommends the use of billet cam cores and short travel Hydraulic Roller lifters which tolerate higher spring loads. Please don't hesitate to contact us directly if you question which spring is correct for your application.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eAFR Titanium Valves\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e- Might require lash caps and different length pushrods. Titanium valves are coated, do not grind valves because it removes the protective coating.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003ePiston to Valve\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e- AFR assumes no responsibility for damage if the end user builds an engine without properly verifying he has enough piston to valve clearance (depth and radial clearance both checked). We recommend a minimum depth of .080\" on the intake valve and .100\" on the exhaust with a radial clearance of .020\" minimum around the perimeter of each valve. Clay is recommended to visually verify both depth as well as radial clearance. Just checking depth is not enough, the position of the valve pocket must also be addressed.\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cstrong data-mce-fragment=\"1\"\u003eIt is the customers responsibility to verify proper piston to valve clearance.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eCNC Porting\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e- Occasionally a 100% CNC ported head might have a very small area left \"as cast\", this in no way affects performance.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eShaft Mount Rockers\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e- Shaft mount rockers might require additional clearance for proper pushrod fitment. Do not clearance the push rod area as the wall is .060\" thick. If you use Jesel Shaft Mounts, AFR only recommends their Pro Series.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eComp Cams Pro Magnum Rockers\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e- Typically these rocker arms do not clear a 1.500\" O.D retainer. A lash cap is required to space up the rocker arm.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eSpring Installation\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e- To ease installation with 1.550\" O.D or larger springs, 12 pt head bolt or studs are recommended for extra clearance. Beveled or ground washers might be needed (ARP #200-8504 comes with smaller O.D and doesn't need to be ground)\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Spring Installed Heights\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e- AFR valve spring installed height spec is +\/- .015 which is the smallest shim available for adjustment.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Arms\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003c\/strong\u003e- Use full roller rocker arms, roller tip rockers with stock style bodies are NOT recommended.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/section\u003e","brand":"Air Flow Research","offers":[{"title":"Default Title","offer_id":40133125144689,"sku":"AFR3640","price":5582.29,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1088\/6742\/files\/Oval_Head__82481.1449252831.500.290.png?v=1684166954","url":"https:\/\/www.parkautomotorsports.ca\/products\/afr3640","provider":"Park Auto Motorsports","version":"1.0","type":"link"}