{"product_id":"e-street-gen-iv-chevrolet-ls3-inconel-exhaust-valves-0-570-maximum-lift","title":"Edelbrock 77621 - E-Street, Gen IV Chevrolet LS3, Inconel Exhaust Valves, 0.570\" maximum lift","description":"\u003cp\u003eEdelbrock introduces its new E-Street 15-degree LS3 69cc cylinder heads (PN 77620) as a premium replacement option, ensuring great power on any high-performance or stock GM LS3 engine build. These heads offer the best performance value of any aftermarket GM LS3 head.\u003c\/p\u003e\u003cp\u003eSold in pairs and assembled with premium COMP Cams® valve train components, these LS3 heads are engineered with the same architecture as the factory head, and all stock components will fit without issue. The assembled heads feature Beehive™ Valve Springs, chromoly steel retainers, heavy-duty stainless-steel \u0026amp; Inconel valves, and top-quality valve seals  – all inspected and assembled by qualified Edelbrock technicians. The intake valve size is 2.165” while the exhaust is 1.590”. The Beehive Valve Springs allow up to .570” lift camshafts, ideal for many mild to hot camshaft grinds.\u003c\/p\u003e\u003cp\u003eEdelbrock E-Street 15-degree LS3 cylinder heads are manufact ured with premium aluminum alloy, machined to the industry’s tightest tolerances. They feature manganese bronze valve guides for extended wear, with particular emphasis placed on holding precision tolerances on valve seat concentricity. This allows the valves to seal securely, eliminating any leak -down and increasing cylinder pressures during engine operation.\u003c\/p\u003e\u003cp\u003eAll Edelbrock cylinder heads feature patented Clean Cast Technology™, a revolutionary process that eliminates casting flaws and promotes a smoother internal surface finish for greater air and coolant flow. These benefits provide mor e power and increased cooling ability right out of the box. A unique dual spark-plug-pocket design allows you to use the factory-style tapered-seat spark plugs or gasket-seat spark plugs available in wider heat ranges for maximum tunability.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSold in Pairs (2 complete, assembled heads per part number)\u003c\/li\u003e\n\u003cli\u003eReady to bolt on out of the box\u003c\/li\u003e\n\u003cli\u003e2.165\" Stainless Intake Valve, 1.59\" Stainless Exhaust Valve\u003c\/li\u003e\n\u003cli\u003eGM LS3 Compatible\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAssembled:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC Machined Exhaust Port:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC Machined Intake Port:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC-Machined Combustion Chamber:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCombustion Chamber Volume:\u003c\/strong\u003e 69 cc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust Port Shape:\u003c\/strong\u003e D Shape\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust Valve Angle:\u003c\/strong\u003e 15 deg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGuide Plates Included:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGuidplate Pushrod Size:\u003c\/strong\u003e Hydraulic flat tappet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake Port Location:\u003c\/strong\u003e Stock\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake Port Shape:\u003c\/strong\u003e Rectangle\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake Runner Volume:\u003c\/strong\u003e 260 cc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake Valve Angle:\u003c\/strong\u003e 15 deg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake Valve Job Diameter:\u003c\/strong\u003e 2.165 in\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake Valve Stem Diameter:\u003c\/strong\u003e 8 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e Sold in Pairs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetainer Diameter:\u003c\/strong\u003e Standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetainer Material:\u003c\/strong\u003e Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRocker Arm Studs Included:\u003c\/strong\u003e 2.140 in\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpark Plug Style:\u003c\/strong\u003e 14mm, 3\/4\" Reach, 5\/8\" Hex\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteam Holes Drilled:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Cover Mounting Style:\u003c\/strong\u003e Center bolt LS3 compatible\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Guide Material:\u003c\/strong\u003e Manganese Bronze\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Guide Size I.D.:\u003c\/strong\u003e 8 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Guide Size O.D.:\u003c\/strong\u003e .502 in\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Spring Diameter:\u003c\/strong\u003e 1.282\" \/ 1.077\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Spring Maximum Lift:\u003c\/strong\u003e .570 in\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Spring Type:\u003c\/strong\u003e Beehive\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Edelbrock","offers":[{"title":"Default Title","offer_id":44849592565895,"sku":"EDE77621","price":2581.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0744\/4008\/1543\/files\/f3045331-0140-4a2b-9681-d049e55507c7.jpg?v=1788268640","url":"https:\/\/checkout.northernperformance.ca\/products\/e-street-gen-iv-chevrolet-ls3-inconel-exhaust-valves-0-570-maximum-lift","provider":"Northern Performance","version":"1.0","type":"link"}