Performer RPM Cylinder Head, Small-Block Oldsmobile, Hyd Roller

Sold Individually

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 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.

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° 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.

Although 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.

Manufacturer	Edelbrock
Application	Application Specific
UPC	085347610358
Series	Performer RPM
Quantity	Sold Individually
Availability Note	Available to Order
Warranty	12 Months
Intake Valve Diameter	2.150 in
Emissions Code
Features and Benefits	Factory 6-degree valve angle High Flow Intake and Exhaust Ports Modern Chamber Design 3.9375” Min Bore Spark Plug Position optimized Helicoil inserts in the exhaust and rocker stud threaded holes Pre-counterbored head bolt holes for ½” dia. studs No heat crossover O.E. Position Intake Port Entry and Exhaust Port Exit Stud and Guide Plate Valvetrain System (OEM is Pedestal type) Added Material Above Intake Port Mechanical fuel pump clearance cut
Hazardous Materials Warning	WARNING: This product can expose you to Lead, which is known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.P65warnings.ca.gov.
Intake Runner Volume	200 cc
Material	Aluminum
Push Rod Diameter	(Suggested) 0.375 in
Valve Angle	6 Degree
Valve Spring Maximum Lift	0.600 in
Valve Stem Diameter	0.3438 in