{"title":"Performance 501 and Ported 502 Heads","description":"","products":[{"product_id":"cly-head-40-by-35-5-valves-single-high-rev-85-5-bore","title":"501 Series Performance Heads 40 by 35.5 Valves, Pair","description":"\u003cp\u003e\u003cstrong\u003eThis is a brand new Set of 501 High Performance Cylinder Heads for a VW Type 1 2 or 3 Dual Port. Heads comes with Stainless Steel 40mm Intake and a Stainless Steel 35.5mm Exhaust Valves, with Harden Keepers, Chromoly retainers, and Single high rev springs. They are ready to install.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe 501 Series Castings come STD with: Increased material at the intake surface giving you the ability to make much bigger ports. A modernized Combustion chamber, for increased head flow \u0026amp; performance. A second Full Fin, so you can Fly cut your heads deeper to achieve almost any desired Head CC volume needed. Blocked off rocker stud bosses, to eliminate the O-ring and stop possible oil leaks. Long reach 3\/4 Inch Spark Plugs, to reduce the chance of cracking between the Valve seat and Plug. \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEngine: \u003c\/strong\u003eVW Type 1 2 and 3 1600 Dual Port\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSprings: \u003c\/strong\u003eSingle or Dual High rev\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eValves: \u003c\/strong\u003e40mm Intake by 35.5mm Exhaust\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCasting: \u003c\/strong\u003eAA Performance 501\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlug Size: \u003c\/strong\u003e12mm (ReplacementNGK Number is D8EA)\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong data-mce-fragment=\"1\"\u003eHead CC's:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e55\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBore: \u003c\/strong\u003e85.5, works with 85.5,87, and 88 slip in kits\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBore: \u003c\/strong\u003e92, works with 88 thick wall, 90.5 and 92mm kits\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBore: \u003c\/strong\u003e94, works with 92 thick walls K and M, and 94mm kits\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003ePlease Pick Bore size, and Spring Upgrade when ordering Above\u003c\/strong\u003e\u003c\/p\u003e","brand":"AA Performance Products","offers":[{"title":"Default Title","offer_id":846206371,"sku":"501 420 XXB X2","price":793.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0574\/5353\/products\/501-460-92B-Front_78e94889-43de-4265-8631-187fe1bb145f.jpg?v=1756336422"},{"product_id":"501-series-performance-heads-42-by-37-5-valves-pair","title":"501 Series Performance Heads 42 by 37.5 Valves, Pair","description":"\u003cp\u003e\u003cstrong\u003eThis is a brand new Set of 501 High Performance Cylinder Heads for a VW Type 1 2 or 3 Dual Port. Heads comes with Stainless Steel 42mm Intake and a Stainless Steel 35.5mm Exhaust Valves, with Harden Keepers, Chromoly retainers, and Single high rev springs. They areready to install.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe 501 Series Castings come STD with: Increased material at the intake surface giving you the ability to make much bigger ports. A modernized Combustion chamber, for increased head flow \u0026amp; performance. A second Full Fin, so you can Fly cut your heads deeper to achieve almost any desired Head CC volume needed. Blocked off rocker stud bosses, to eliminate the O-ring and stop possible oil leaks. Long reach 3\/4 Inch Spark Plugs, to reduce the chance of cracking between the Valve seat and Plug.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEngine: \u003c\/strong\u003eVW Type 1 2 and 3 1600 Dual Port\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSprings: \u003c\/strong\u003eSingle or Dual High rev\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eValves: \u003c\/strong\u003e42mm Intake by 37.5mm Exhaust\u003c\/p\u003e\n\u003cp\u003e\u003cstrong data-mce-fragment=\"1\"\u003eHead CC's:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e55\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCasting: \u003c\/strong\u003eAA Performance 501\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlug Size: \u003c\/strong\u003e12mm (ReplacementNGK Number is D8EA)\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBore: \u003c\/strong\u003e85.5, works with 85.5,87, and 88 slip in kits\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBore: \u003c\/strong\u003e92, works with 88 thick wall, 90.5 and 92mm kits\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBore: \u003c\/strong\u003e94, works with 92 thick walls K and M, and 94mm kits\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003ePlease Pick Bore size, and Spring Upgrade when ordering Above\u003c\/strong\u003e\u003c\/p\u003e","brand":"AA Performance Products","offers":[{"title":"Default Title","offer_id":977244119,"sku":"501 440 XXB X2","price":793.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0574\/5353\/products\/501-460-92B-Front_1a25439f-4ad9-4bd1-a585-72cdd7a06b31.jpg?v=1756336300"},{"product_id":"501-series-performance-heads-44-by-37-5-valves-pair","title":"501 Series Performance Heads 44 by 37.5 Valves, Pair","description":"\u003cp\u003e\u003cstrong\u003eThis is a brand new Set of 501 High Performance Cylinder Heads for a VW Type 1 2 or 3 Dual Port. Heads comes with Stainless Steel 44mm Intake and a Stainless Steel 37.5mm Exhaust Valves, with Harden Keepers, Chromoly retainers, and Single high rev springs. They areready to install.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe 501 Series Castings come STD with: Increasedmaterialat the intakesurfacegivingyou theabilityto make much bigger ports. Amodernized Combustionchamber, for increased head flow \u0026amp; performance. AsecondFull Fin, soyou\u003c\/strong\u003e\u003cstrong\u003ecanFlycutyourheads deeper to achieve almost any desired Head CC volume needed. Blocked off rocker stud bosses, to eliminate the O-ring and stoppossibleoil leaks. Long reach \u003cstrong\u003e3\/4 Inch \u003c\/strong\u003eSparkPlugs, toreduce the chance of cracking betweenthe Valve seat and Plug.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEngine: \u003c\/strong\u003eVW Type 1 2 and 3 1600 Dual Port\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSprings: \u003c\/strong\u003eSingle or Dual High rev\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eValves: \u003c\/strong\u003e44mm Intake by 37.5mm Exhaust\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCasting: \u003c\/strong\u003eAA Performance 501\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlug Size: \u003c\/strong\u003e12mm (ReplacementNGK Number is D8EA)\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong data-mce-fragment=\"1\"\u003eHead CC's:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e55\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBore: \u003c\/strong\u003e85.5, works with 85.5,87, and 88 slip in kits\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBore: \u003c\/strong\u003e92, works with 88 thick wall, 90.5 and 92mm kits\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBore: \u003c\/strong\u003e94, works with 92 thick walls K and M, and 94mm kits\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003ePlease Pick Bore size, and Spring Upgrade when ordering Above\u003c\/strong\u003e\u003c\/p\u003e","brand":"AA Performance Products","offers":[{"title":"Default Title","offer_id":977256567,"sku":"501 460 XXB X2","price":793.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0574\/5353\/products\/501-460-92B-Front_b7bb5913-d41f-493c-bf1a-e4aa329395e9.jpg?v=1756336298"},{"product_id":"502-series-performance-heads-40-by-35-5-valves-pair","title":"502 Series Performance Heads 40 by 35.5 Valves, Pair","description":"\u003cp\u003e\u003cstrong\u003eThis is a brand new Set of 502 High Performance Cylinder Heads for a VW Type 1 2 or 3 Dual Port. Heads comes with Casted Stage 2 Port \u0026amp; Polished Stainless Steel 40mm Intake and a Stainless Steel 35.5mm Exhaust Valves, with Harden Keepers, Chromoly retainers, and Dual high rev springs. They are ready to install.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe 502 Series comes ported for you with a modernized combustion chamber for increased head flow \u0026amp; performance. There is a second Full Fin, so you can Fly cut your heads deeper to achieve almost any desired Head CC volume needed. Blocked off rocker stud bosses, to eliminate the O-ring and stop possible oil leaks. Long reach 3\/4 Inch Spark Plugs, to reduce the chance of cracking between the Valve seat and Plug. \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEngine: \u003c\/strong\u003eVW Type 1 2 and 3 1600 Dual Port\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSprings: \u003c\/strong\u003eDual High rev\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eValves: \u003c\/strong\u003e40mm Intake by 35.5mm Exhaust\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCasting: \u003c\/strong\u003eAA Performance 502\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlug Size: \u003c\/strong\u003e12mm (ReplacementNGK Number is D8EA)\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHead CC's:\u003c\/strong\u003e55\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBore: \u003c\/strong\u003e85.5, works with 85.5,87, and 88 slip in kits\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBore: \u003c\/strong\u003e92, works with 88 thick wall, 90.5 and 92mm kits\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBore: \u003c\/strong\u003e94, works with 92 thick walls K and M, and 94mm kits\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003ePlease Pick Bore size, and Spring Upgrade when ordering Above\u003c\/strong\u003e\u003c\/p\u003e","brand":"AA Performance Products","offers":[{"title":"Default Title","offer_id":42099857752312,"sku":"502 420 XXB S1 X2","price":839.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0574\/5353\/products\/502-420-85B.jpg?v=1756333478"},{"product_id":"502-series-performance-heads-42-by-37-5-valves-pair","title":"502 Series Performance Heads 42 by 37.5 Valves, Pair","description":"\u003cp\u003e\u003cstrong\u003eThis is a brand new Set of 502 High Performance Cylinder Heads for a VW Type 1 2 or 3 Dual Port. Heads comes with Stainless Steel 42mm Intake and a Stainless Steel 37.5mm Exhaust Valves, with Harden Keepers, Chromoly retainers, and Dual high rev springs. They areready to install.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe 502 Series comes ported for you with a modernized combustion chamber for increased head flow \u0026amp; performance. There is a second Full Fin, so you can Fly cut your heads deeper to achieve almost any desired Head CC volume needed. Blocked off rocker stud bosses, to eliminate the O-ring and stop possible oil leaks. Long reach 3\/4 Inch Spark Plugs, to reduce the chance of cracking between the Valve seat and Plug.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEngine: \u003c\/strong\u003eVW Type 1 2 and 3 1600 Dual Port\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSprings: \u003c\/strong\u003eDual High rev\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eValves: \u003c\/strong\u003e42mm Intake by 37.5mm Exhaust\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCasting: \u003c\/strong\u003eAA Performance 502\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlug Size: \u003c\/strong\u003e12mm (ReplacementNGK Number is D8EA)\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong data-mce-fragment=\"1\"\u003eHead CC's:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e55\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBore: \u003c\/strong\u003e85.5, works with 85.5,87, and 88 slip in kits\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBore: \u003c\/strong\u003e92, works with 88 thick wall, 90.5 and 92mm kits\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBore: \u003c\/strong\u003e94, works with 92 thick walls K and M, and 94mm kits\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003ePlease Pick Bore size, and Spring Upgrade when ordering Above\u003c\/strong\u003e\u003c\/p\u003e","brand":"AA Performance Products","offers":[{"title":"Default Title","offer_id":42100641595640,"sku":"502 440 XXB S1 X2","price":839.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0574\/5353\/products\/502-420-85B_872f4e47-aac2-47d2-9039-8193e5ea03ab.jpg?v=1756333477"},{"product_id":"502-series-performance-heads-44-by-37-5-valves-pair","title":"502 Series Performance Heads 44 by 37.5 Valves, Pair","description":"\u003cp\u003e\u003cstrong\u003eThis is a brand new Set of 502 High Performance Cylinder Heads for a VW Type 1 2 or 3 Dual Port. Heads comes with Stainless Steel 44mm Intake and a Stainless Steel 37.5mm Exhaust Valves, with Harden Keepers, Chromoly retainers, and Dual high rev springs. They are ready to install.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe 502 Series comes ported for you with a modernized combustion chamber for increased head flow \u0026amp; performance. There is a second Full Fin, so you can Fly cut your heads deeper to achieve almost any desired Head CC volume needed. Blocked off rocker stud bosses, to eliminate the O-ring and stop possible oil leaks. Long reach 3\/4 Inch Spark Plugs, to reduce the chance of cracking between the Valve seat and Plug.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEngine: \u003c\/strong\u003eVW Type 1 2 and 3 1600 Dual Port\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSprings: \u003c\/strong\u003eDual High rev\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eValves: \u003c\/strong\u003e44mm Intake by 37.5mm Exhaust\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCasting: \u003c\/strong\u003eAA Performance 502\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlug Size: \u003c\/strong\u003e12mm (Replacement NGK Number is D8EA)\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong data-mce-fragment=\"1\"\u003eHead CC's:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e55\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBore: \u003c\/strong\u003e85.5, works with 85.5,87, and 88 slip in kits\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBore: \u003c\/strong\u003e92, works with 88 thick wall, 90.5 and 92mm kits\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBore: \u003c\/strong\u003e94, works with 92 thick walls K and M, and 94mm kits\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003ePlease Pick Bore size, and Spring Upgrade when ordering Above\u003c\/strong\u003e\u003c\/p\u003e","brand":"AA Performance Products","offers":[{"title":"Default Title","offer_id":42104330223864,"sku":"502 460 XXB S1 X2","price":839.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0574\/5353\/products\/502-420-85B_ba100f21-c81a-4ba0-9c06-60b972f6b6a1.jpg?v=1756333476"}],"url":"https:\/\/aapistons.com\/collections\/performance-501-and-ported-502-heads\/type-3.oembed","provider":"AA Performance Products Inc.","version":"1.0","type":"link"}