{"product_id":"edelbrock-sb-oldsmobile-performer-rpm-cylinder-heads-for-hydraulic-flat-tappet","title":"Edelbrock SB Oldsmobile Performer RPM Cylinder Heads for Hydraulic Flat Tappet","description":"\u003cp\u003e\u003cstrong\u003e⚠ No shipping to California due to CARB regulation.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIntended for installation on 1965-1976 Small-Block Oldsmobile 350-403 c.i. engines equipped with a flat tappet camshaft, these 356-T6 aluminum casting cylinder heads (PN61039) are a modern refinement to our PN6051 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 PN61025\/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. Although 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 PN 61025 and PN 61029 for big-block specific cylinder heads.\u003c\/p\u003e\u003cp\u003eFor 350-403 c.i. Olds engines with a flat tappet cam, these heads are made of 356-T6 aluminum with 68 cc chambers, high-flow 200 cc intake and 130 cc exhaust port volumes, and 2.072” intake and 1.680” exhaust valve sizes.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eRetains compatibility with OEM and popular aftermarket manifolds and Headers\u003c\/li\u003e\n\u003cli\u003eMaximum compatibility with OEM and aftermarket components\u003c\/li\u003e\n\u003cli\u003eAllows the use of an \"OEM\" style mechanical fuel pump\u003c\/li\u003e\n\u003cli\u003eMechanical Fuel Pump Clearance Cutout\u003c\/li\u003e\n\u003cli\u003eFactory 6-degree valve angle\u003c\/li\u003e\n\u003cli\u003eOEM Port Locations\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3 class=\"fitment-table-managed-heading\"\u003eVehicle Fitment\u003c\/h3\u003e\u003cstyle\u003etable.fitment-table-managed, .fitment-table-managed th, .fitment-table-managed td { border: 1px solid #ddd; border-collapse: collapse; padding: 4px 8px; text-align: left; font-size: 14px; }\u003c\/style\u003e\u003ctable class=\"fitment-table-managed\" data-fitment-source=\"turn14-app\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eTrim\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cbr\u003e\u003cstyle\u003etable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }\u003c\/style\u003e\u003ctable class=\"productattributes\"\u003e\n\u003cthead\u003e\u003ctr\u003e\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\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\/tbody\u003e\n\u003c\/table\u003e\u003cbr\u003e","brand":"Edelbrock","offers":[{"title":"Default Title","offer_id":47684123525271,"sku":"ede61039","price":1305.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0497\/9697\/2695\/files\/25b0c4a30da398c73b4231e92ef0c4afL.jpg?v=1776394681","url":"https:\/\/nlpperformance.com\/en-ca\/products\/edelbrock-sb-oldsmobile-performer-rpm-cylinder-heads-for-hydraulic-flat-tappet","provider":"Next Level Performance","version":"1.0","type":"link"}