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.
This Part Fits:
| Year |
Make |
Model |
Submodel |
| 1975 |
Buick |
Apollo |
Base |
| 1975 |
Buick |
Apollo |
SR |
| 1975-1976 |
Buick |
Century |
Base |
| 1975-1977 |
Buick |
Century |
Custom |
| 1976 |
Buick |
Century |
Indianapolis 500 Pace Car |
| 1975 |
Buick |
Century |
Luxus |
| 1977-1979 |
Buick |
Electra |
225 |
| 1977-1979 |
Buick |
Electra |
Limited |
| 1978-1979 |
Buick |
Electra |
Park Avenue |
| 1977-1979 |
Buick |
Estate Wagon |
Base |
| 1975,1977-1978 |
Buick |
LeSabre |
Base |
| 1975-1978 |
Buick |
LeSabre |
Custom |
| 1977 |
Buick |
LeSabre |
Custom Sport |
| 1975-1976 |
Buick |
Regal |
Base |
| 1976 |
Buick |
Regal |
SR |
| 1977-1978 |
Buick |
Riviera |
Base |
| 1978 |
Buick |
Riviera |
LXXV Anniversary Edition |
| 1975-1976 |
Buick |
Skylark |
Base |
| 1976 |
Buick |
Skylark |
S |
| 1975-1976 |
Buick |
Skylark |
SR |
| 1976 |
Cadillac |
Seville |
Base |
| 1975 |
Chevrolet |
Bel Air |
Base |
| 1975 |
Chevrolet |
Camaro |
Base |
| 1975 |
Chevrolet |
Camaro |
LT |
| 1975 |
Chevrolet |
Camaro |
RS |
| 1975 |
Chevrolet |
Caprice |
Classic |
| 1975 |
Chevrolet |
Caprice |
Classic Sport |
| 1975 |
Chevrolet |
El Camino |
Base |
| 1975 |
Chevrolet |
El Camino |
Classic |
| 1975 |
Chevrolet |
Impala |
Base |
| 1975 |
Chevrolet |
Impala |
Custom |
| 1975 |
Chevrolet |
Impala |
Sport |
| 1975 |
Chevrolet |
Monte Carlo |
S |
| 1975 |
Chevrolet |
Nova |
Base |
| 1975 |
Chevrolet |
Nova |
Custom |
| 1975 |
Chevrolet |
Nova |
LN |
| 1975 |
GMC |
Sprint |
Base |
| 1975 |
GMC |
Sprint |
Classic |
| 1975 |
GMC |
Sprint |
High Sierra |
| 1975 |
GMC |
Sprint |
SP |
| 1977-1979 |
Oldsmobile |
98 |
Luxury |
| 1977-1979 |
Oldsmobile |
98 |
Regency |
| 1977-1979 |
Oldsmobile |
Custom Cruiser |
Base |
| 1975 |
Oldsmobile |
Cutlass |
442 |
| 1968-1975 |
Oldsmobile |
Cutlass |
Base |
| 1977 |
Oldsmobile |
Cutlass |
Colonnade |
| 1976-1977 |
Oldsmobile |
Cutlass |
Colonnade S |
| 1972 |
Oldsmobile |
Cutlass |
Cruiser |
| 1968,1971-1977 |
Oldsmobile |
Cutlass |
S |
| 1976-1977 |
Oldsmobile |
Cutlass |
Vista Cruiser |
| 1975-1977 |
Oldsmobile |
Cutlass Salon |
Base |
| 1968-1977 |
Oldsmobile |
Cutlass Supreme |
Base |
| 1977 |
Oldsmobile |
Cutlass Supreme |
Brougham |
| 1976-1977 |
Oldsmobile |
Cutlass Supreme |
Colonnade |
| 1974-1975 |
Oldsmobile |
Cutlass Supreme |
Cruiser |
| 1975 |
Oldsmobile |
Cutlass Supreme |
Hurst |
| 1976 |
Oldsmobile |
Cutlass Tiara |
Base |
| 1968 |
Oldsmobile |
Delmont 88 |
Base |
| 1968-1979 |
Oldsmobile |
Delta 88 |
Base |
| 1968 |
Oldsmobile |
Delta 88 |
Custom |
| 1972-1979 |
Oldsmobile |
Delta 88 |
Royale |
| 1968-1972 |
Oldsmobile |
F85 |
Base |
| 1973-1976 |
Oldsmobile |
Omega |
Base |
| 1976 |
Oldsmobile |
Omega |
Brougham |
| 1976 |
Oldsmobile |
Omega |
F85 |
| 1975 |
Oldsmobile |
Omega |
Salon |
| 1976 |
Oldsmobile |
Omega |
SX |
| 1977-1978 |
Oldsmobile |
Toronado |
Brougham |
| 1977 |
Oldsmobile |
Toronado |
XS |
| 1977-1978 |
Oldsmobile |
Toronado |
XSR |
| 1968-1975 |
Oldsmobile |
Vista Cruiser |
Base |
| 1977-1979 |
Pontiac |
Bonneville |
Base |
| 1977-1979 |
Pontiac |
Bonneville |
Brougham |
| 1978-1979 |
Pontiac |
Bonneville |
Safari |
| 1977-1978 |
Pontiac |
Catalina |
Base |
| 1977-1979 |
Pontiac |
Catalina |
Safari |
| 1976-1977 |
Pontiac |
Firebird |
Base |
| 1976 |
Pontiac |
Firebird |
Esprit |
| 1976-1979 |
Pontiac |
Firebird |
Formula |
| 1977-1979 |
Pontiac |
Firebird |
Trans Am |
| 1975 |
Pontiac |
Grand Am |
Base |
| 1975-1977 |
Pontiac |
Grand LeMans |
Base |
| 1977 |
Pontiac |
Grand LeMans |
Safari |
| 1976-1977 |
Pontiac |
Grand Prix |
Base |
| 1977 |
Pontiac |
Grand Prix |
LJ |
| 1977 |
Pontiac |
Grand Prix |
SJ |
| 1975-1977 |
Pontiac |
LeMans |
Base |
| 1977 |
Pontiac |
LeMans |
Safari |
| 1975-1977 |
Pontiac |
LeMans |
Sport |
| 1975-1976 |
Pontiac |
Ventura |
Base |
| 1975 |
Pontiac |
Ventura |
Custom |
| 1975 |
Pontiac |
Ventura |
S |
| 1975-1976 |
Pontiac |
Ventura |
SJ |