{"product_id":"ed61599","title":"ED61599","description":"\u003cb\u003ePerformer Cylinder Heads - Single - Complete\u003c\/b\u003e\u003cb\u003ePontiac 389-455, 195cc Intake Port, 72cc CNC Ported Combustion Chambers\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eBrand: \u003c\/b\u003e\u003cspan\u003eEDELBROCK\u003c\/span\u003e\u003cbr\u003e\u003cb\u003ePart Number: \u003c\/b\u003e\u003cspan\u003eED61599\u003c\/span\u003e\u003cbr\u003e\u003cb\u003eDescription: \u003c\/b\u003e\u003cdiv class=\"value description\"\u003e \u003cp\u003eThese heads use the popular Pontiac D-Port exhaust port exits for use with standard D-port aftermarket exhaust systems. Performer Pontiac heads are designed for 1962-79 389, 400, 421, 428 and 455 cid V8 Pontiac engines with a 4.060\" or larger bore. Manufactured with optimized oil return passages for improved flow. Will accept factory pushrod guideplates (must split guideplate pairs), rocker studs and accessory bosses. The casting is manufactured from A356 aluminium and heat treated to T6 spec for superior quality. These heads are available in three dual quench combustion chamber sizes, including 65cc, 72cc, and 87cc; the 72cc combustion chambers provide a 9.5:1 compression ratio when used with flat-top pistons. The spark plug has been relocated closer to the exhaust valve for improved performance. These heads are cast with extra thick port walls and a compact port size, making them ideal for CNC \u0026amp; hand porting. Heat crossover is machined for 50-state emissions legal performance. \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCombustion chamber volume:\u003c\/strong\u003e 72cc \u003cbr\u003e\u003cstrong\u003eIntake runner volume:\u003c\/strong\u003e 195cc\u003cbr\u003e \u003cstrong\u003eExhaust runner volume:\u003c\/strong\u003e 145cc\u003cbr\u003e \u003cstrong\u003eIntake valve diameter:\u003c\/strong\u003e 2.11\"\u003cbr\u003e \u003cstrong\u003eExhaust valve diameter:\u003c\/strong\u003e 1.66\"\u003cbr\u003e \u003cstrong\u003eValve stem diameter: \u003c\/strong\u003e 11\/32\"\u003cbr\u003e\u003cstrong\u003e Valve guides:\u003c\/strong\u003e Manganese bronze \u003cbr\u003e\u003cstrong\u003e Deck thickness:\u003c\/strong\u003e 5\/8\" \u003cbr\u003e\u003cstrong\u003eValve spring diameter: \u003c\/strong\u003e1.46\"; 120lbs. @ 1.80\" Installed Ht. \u003cbr\u003e\u003cstrong\u003eValve spring maximum lift:\u003c\/strong\u003e.550\"; 1.150\" Coil bind\u003cbr\u003e\u003cstrong\u003e Rocker stud:\u003c\/strong\u003e 7\/16\" \u003cbr\u003e\u003cstrong\u003eGuideplate: \u003c\/strong\u003e Hardened Steel\u003cbr\u003e \u003cstrong\u003ePushrod diameter: \u003c\/strong\u003e 5\/16\"\u003cbr\u003e\u003cstrong\u003e Valve Angle:\u003c\/strong\u003e 14° \u003cbr\u003e\u003cstrong\u003eExhaust port location:\u003c\/strong\u003e D-Port Stock location\u003cbr\u003e\u003cstrong\u003e Spark plug fitment:\u003c\/strong\u003e 14mm x 3\/4\" reach, gasket seat \u003cbr\u003e\u003cstrong\u003eMade In: \u003c\/strong\u003e USA\u003c\/p\u003e\n\u003c\/div\u003e","brand":"EDELBROCK","offers":[{"title":"Default Title","offer_id":43505063264427,"sku":"ED61599","price":4774.65,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0520\/9319\/0315\/files\/edelbrock-ed61599-srcopyright-1159738200.jpg?v=1749009365","url":"https:\/\/stealthride.co.nz\/products\/ed61599","provider":"Stealth Ride","version":"1.0","type":"link"}