{"product_id":"edelbrock-cylinder-head-sb-chevrolet-performer-rpm-e-tec-170-for-hydraulic-roller-cam-complete-ea","title":"Edelbrock Cylinder Head SB Chevrolet Performer RPM E-Tec 170 for Hydraulic Roller Cam Complete (Ea)","description":"Cyl Head Specifications: Combustion chamber vol: 64cc; Intake runner vol: 170cc; Exhaust runner vol: 70cc; Intake valve dia: 1.94\"; Exhaust valve dia: 1.55\"; Valve stem dia: 11\/32\"; Valve guides: Maganese bronze; Deck thickness: 5\/8\"; Valve spring diameter: 1.46\"; Valve spring maximum lift: .575\"; Rocker stud: 3\/8\"; Pushrod diameter: 5\/16\"; Valve angle: 23°; Exhaust port location: Stock; Spark plug fitment: 14mm x .750 reach, gasket seat. * Edelbrock E-Tec Cylinder Heads are replacements for 302, 327, 350 \u0026amp; 400 c.i.d. S\/B Chevy engines with \"Vortec-style\" manifolds. They feature an LT1-style raised runner intake port design for increased air-flow and ultimate performance. A unique combustion chamber design positions the spark plug closer to the center of the cylinder, promoting a more efficient combustion resulting in more power. These cylinder heads include an adjustable rocker stud and guide plate set-up for use with adjustable rockers or washers to properly position the stud height to accommodate factory style self-aligning rocker arms. They have 20% more exhaust flow than cast iron Vortec heads, great performance up to 6000 rpm and can produce 9.5:1 compression with stock pistons in 350 cubic-inch engines. RPM E-Tec heads are dual-drilled and will accept 1987-95 centerbolt and\/or 1986 \u0026amp; prior perimeter flange mount valve covers and most stock exhaust manifolds. ** Match with Edelbrock head gasket sets. Bare heads will have valve guides and seats installed, but will require final sizing and a valve job to match the valves you will be using. Recommended spark plugs are Champion RC12YC or equivalent 14mm x 3\/4\" reach with flat gasket seat. To use stock rockers on S\/B Chevy heads, .100\" longer than stock pushrods are required. Edelbrock pushrods #9629 are recommended. Use Head Bolt Kits for easy installation. S\/B Chevy heads may not be used on engines with less than 4\" bore (262, 265, 283, 305, 307 c.i.d.) except with cams having less than .450\" valve lift.","brand":"Edelbrock","offers":[{"title":"Default Title","offer_id":40597459927219,"sku":"EDE60975","price":1124.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0590\/3758\/1491\/products\/23297fff932ce28e01a3466364b0e099.jpg?v=1631980178","url":"https:\/\/hellhoundperformance.store\/products\/edelbrock-cylinder-head-sb-chevrolet-performer-rpm-e-tec-170-for-hydraulic-roller-cam-complete-ea","provider":"Hellhound Performance","version":"1.0","type":"link"}