{"product_id":"edelbrock-sb-oldsmobile-performer-rpm-cylinder-heads-for-hydraulic-roller-cam","title":"Edelbrock SB Oldsmobile Performer RPM Cylinder Heads for Hydraulic Roller Cam","description":"\u003cp\u003eIntended for installation on 1965-1976 Small-Block Oldsmobile 350-403 c.i. engines equipped with a hydraulic roller camshaft, these 356-T6 aluminum casting cylinder heads (#61035) are a modern refinement to our #6051 heads, except they can accommodate a factory-style mechanical fuel pump. A smaller 68 cc combustion chamber achieves a more appropriate small block compression ratio compared to our PN 61025\/61029’s larger 77 cc chamber, which yields a lower compression ratio than most engine builders desire on a small block engine. These heads require a 3.9375” minimum bore and feature a modern chamber design with optimized spark plug positioning. Maximum airflow is achieved through the factory 6-degree valve angle using high-flow 200 cc intake and 130 cc exhaust port volumes, along with 2.072” intake and 1.680” exhaust valve sizes in their O.E. positions. A finished deck thickness with added material above the intake port and pre-counterbored head-bolt holes for .5” diameter studs provide extra clamping force in key areas. A stud-and-guide plate valvetrain system (as opposed to the O.E. pedestal type) provides a solid foundation for the beefier diameter pushrods, and Helicoil inserts in the exhaust and rocker stud holes keep bolts secured. However, there are no provisions for a heat crossover.\n\u003cbr\u003eAlthough these heads will fit on Big-Block Oldsmobile engines, the 68-cc combustion chamber size is not ideal for a big-block application as it will raise compression. See PN61025 and PN61029 for big-block specific cylinder heads.\n\u003cbr\u003eFor 350-403 c.i. Olds engines with a hydraulic roller cam, these heads are made of 356-T6 aluminum and feature 68 cc chambers, high-flow 200 cc intake and 130 cc exhaust port volumes, and 2.072” intake and 1.680” exhaust valve sizes.\n\u003cbr\u003e356-T6 Aluminum Casting, 68cc Combustion Chamber Volume, 200cc Intake Port Volume, 130cc Exhaust Port Volume, 2.072” intake and 1.680” exhaust valve sizes, 3\/8” dia. Pushrod diameter, 5\/8” Finished Deck Thickness\n\u003cbr\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cbr\u003e  \u003cli\u003eRetains compatibility with OEM and popular aftermarket manifolds and Headers\u003c\/li\u003e\n\u003cbr\u003e  \u003cli\u003eMaximum compatibility with OEM and aftermarket components\u003c\/li\u003e\n\u003cbr\u003e  \u003cli\u003eAllows the use of an \"OEM\" style mechanical fuel pump\u003c\/li\u003e\n\u003cbr\u003e  \u003cli\u003eMechanical Fuel Pump Clearance Cutout\u003c\/li\u003e\n\u003cbr\u003e  \u003cli\u003eFactory 6-degree valve angle\u003c\/li\u003e\n\u003cbr\u003e  \u003cli\u003eOEM Port Locations\u003c\/li\u003e\n\u003cbr\u003e\n\u003c\/ul\u003e\u003cstyle\u003etable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }\u003c\/style\u003e\n\u003ctable class=\"productattributes\"\u003e\n\u003cthead\u003e\u003ctr\u003e\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbdoy\u003e\n\u003ctr\u003e\u003ctd\u003eAir Freight Prohibited: false\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eNot Carb Approved: true\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eCarb Acknowledgement Required: true\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eLtl Freight Required: false\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eProp 65: Y\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003ePart Type: automotive\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eEpa: N\/A\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eRegular Stock: false\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eUnits Per Sku: 1\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbdoy\u003e\n\u003c\/table\u003e\u003cbr\u003e","brand":"Edelbrock","offers":[{"title":"Default Title","offer_id":46381598605465,"sku":"ede61035","price":1246.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0714\/2611\/3689\/files\/bedffe8f99a73e094927bf56440b5fbeL.jpg?v=1773506832","url":"https:\/\/msvracingpowersports.com\/products\/edelbrock-sb-oldsmobile-performer-rpm-cylinder-heads-for-hydraulic-roller-cam","provider":"MSV Racing","version":"1.0","type":"link"}