{"product_id":"edelbrock-performer-series-61575-d-port-cylinder-head-complete-400-500hp","title":"Edelbrock Performer Series 61575 D-Port Cylinder Head Complete 400-500hp","description":"\u003cp\u003eSpecifications for the cylinder head include combustion chamber volume: (A) 65cc \/ 72cc \/ 87cc; intake runner volume: 204cc; exhaust runner volume: 145cc; intake valve diameter: 2.\u003c\/p\u003e\u003cp\u003e11\"; valve stem diameter: 11\/32\"; exhaust valve diameter: 1.\u003c\/p\u003e\u003cp\u003e66\"; valve guides: manganese bronze; deck thickness: 5\/8\"; valve spring diameter: 1.\u003c\/p\u003e\u003cp\u003e46\"; 120lbs.\u003c\/p\u003e\u003cp\u003e@ 1.\u003c\/p\u003e\u003cp\u003e800\" inst.\u003c\/p\u003e\u003cp\u003eheight; valve spring maximum lift: .\u003c\/p\u003e\u003cp\u003e550\"; 1.\u003c\/p\u003e\u003cp\u003e150\" coil bind; rocker stud: 7\/16\"; guideplate: hardened steel; pushrod diameter: 5\/16\"; valve angle: 14°; exhaust port location: stock; spark plug fitment: 14mm x 3\/4 reach, gasket seat.\u003c\/p\u003e\u003cp\u003ePerformer Pontiac heads utilize a D-Port exhaust port configuration for standard D-port exhaust systems.\u003c\/p\u003e\u003cp\u003eDesigned for 1962-79 389, 400, 421, 455 cid V8 Pontiac engines with a 4.\u003c\/p\u003e\u003cp\u003e060in.\u003c\/p\u003e\u003cp\u003eor larger bore, they feature optimized oil return passages for increased oil flow.\u003c\/p\u003e\u003cp\u003eAvailable in three heart-shaped combustion chamber sizes: 65cc, 72cc, and 87cc.\u003c\/p\u003e\u003cp\u003eThe 65cc combustion chambers are as-cast while the 72cc and 87cc chambers are fully CNCd to provide a 9.\u003c\/p\u003e\u003cp\u003e5: 1 compression ratio when used with flat-top pistons.\u003c\/p\u003e\u003cp\u003eThe spark plug has been relocated closer to the exhaust valve for improved performance.\u003c\/p\u003e\u003cp\u003eCast with extra thick port walls and a compact port size, they are ideal for CNC and hand parting.\u003c\/p\u003e\u003cp\u003eComplete heads include guide plates, rocker studs, and high-quality valve train for direct bolt-on application.\u003c\/p\u003e\u003cp\u003eHead crossover is machined for 50-state emissions legal performance.\u003c\/p\u003e\u003cp\u003eINSTALLATION NOTE: 350 c.\u003c\/p\u003e\u003cp\u003ei.\u003c\/p\u003e\u003cp\u003ed.\u003c\/p\u003e\u003cp\u003eengines may require notching the block for valve clearance.\u003c\/p\u003e\u003cp\u003eThree head bolt bosses are raised higher than standard D-port heights and will require head bolt kit #8561 for installation.\u003c\/p\u003e\u003cp\u003eDeck thickness: 5\/8\", rocker stud diameter: 7\/16\", pushrod diameter: 5\/16\" (width of slot in guide plate).\u003c\/p\u003e","brand":"Edelbrock","offers":[{"title":"Default Title","offer_id":51725398606106,"sku":"EDL61575","price":1776.4,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0975\/8942\/8506\/files\/71iaEoG-ipL_1116f20f-7bcc-4ea6-8871-c0fef745ecbd.jpg?v=1771656656","url":"https:\/\/trybeepbeep.com\/products\/edelbrock-performer-series-61575-d-port-cylinder-head-complete-400-500hp","provider":"TryBeepbeep","version":"1.0","type":"link"}