For 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.

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Intended 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. 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 PN61025 and PN61029 for big-block specific cylinder heads.

• Factory 6-degree valve angle
• Maximum compatibility with OEM and aftermarket components
• Mechanical Fuel Pump Clearance Cutout
• Allows the use of an "OEM" style mechanical fuel pump
• OEM Port Locations
• Retains compatibility with OEM and popular aftermarket manifolds and Headers

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Information:

356-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

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Application Summary:

Year	Make/Model
1975	Buick Apollo
1975-1977	Buick Century
1977-1979	Buick Electra
1977-1979	Buick Estate Wagon
1975-1978	Buick LeSabre
1975-1976	Buick Regal
1977-1978	Buick Riviera
1975-1976	Buick Skylark
1976	Cadillac Seville
1975	Chevrolet Bel Air
1975	Chevrolet Camaro
1975	Chevrolet Caprice
1975	Chevrolet El Camino
1975	Chevrolet Impala
1975	Chevrolet Monte Carlo
1975	Chevrolet Nova
1975	GMC Sprint
1977-1979	Oldsmobile 98
1977-1979	Oldsmobile Custom Cruiser
1968-1977	Oldsmobile Cutlass
1975-1977	Oldsmobile Cutlass Salon
1968-1977	Oldsmobile Cutlass Supreme
1976	Oldsmobile Cutlass Tiara
1968	Oldsmobile Delmont 88
1968-1979	Oldsmobile Delta 88
1968-1972	Oldsmobile F85
1973-1976	Oldsmobile Omega
1977-1978	Oldsmobile Toronado
1968-1975	Oldsmobile Vista Cruiser
1977-1979	Pontiac Bonneville
1977-1979	Pontiac Catalina
1976-1979	Pontiac Firebird
1975	Pontiac Grand Am
1975-1977	Pontiac Grand LeMans
1976-1977	Pontiac Grand Prix
1975-1977	Pontiac LeMans
1975-1976	Pontiac Ventura