{"product_id":"edelbrock-perf-rpm-sb-olds-head-hyd-flat-tap-cam-ede61039","title":"Edelbrock Perf RPM SB Olds Head Hyd Flat Tap Cam 61039","description":"\u003cp\u003eEdelbrock Perf RPM SB Olds Head Hyd Flat Tap Cam 61039\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 (#61039) are a modern refinement to our #6051 heads, except they can accommodate a factory-style mechanical fuel pump. A smaller 68cc combustion chamber achieves a more appropriate small block compression ratio compared to our #61025\/61029’s larger 77cc chamber, which yields a lower compression ratio than most engine builders desire on a small block engine.\n\u003cbr\u003e\u003cbr\u003e\nThese 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° valve angle using high-flow 200cc intake and 130cc exhaust port volumes, along with 2.072” intake and 1.680” exhaust valve sizes in their O.E. positions. A 5\/8” finished deck thickness with added material above the intake port and pre-counterbored head-bolt holes for 1\/2” 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 3\/8” 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\u003e\u003cbr\u003e\nAlthough these heads will fit on Big-Block Oldsmobile engines, the 68cc combustion chamber size is not ideal for a big-block application as it will raise compression. See #61025 and #61029 for big-block specific cylinder heads.\u003c\/p\u003e","brand":"Edelbrock","offers":[{"title":"Default Title","offer_id":68125817733399,"sku":"EDE61039","price":1350.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/mhracesupply.co\/products\/edelbrock-perf-rpm-sb-olds-head-hyd-flat-tap-cam-ede61039","provider":"MH Race Supply","version":"1.0","type":"link"}