The Edelbrock #61025 Performer RPM Cylinder Head for 1965-76 Oldsmobile 400, 425 and 455 CID V8 engines with hydraulic roller cam is a perfect performance upgrade for big-block Olds-powered street machines and muscle cars. This aluminum cylinder head supersedes the 60515 Olds head and features a redesigned 77cc combustion chamber, larger intake valves and refined bowl blending for improved flow. The #61025 Performer RPM head has improved accommodation for a factory-style mechanical fuel pump with spark plug locations moved slightly towards the exhaust valve for optimized combustion. Intake and exhaust ports have been improved over previous designs, and extra material has been added above the intake port for head work. Performer RPM #61025 heads are cast and machined by Edelbrock in the USA and comes complete with the highest quality intake and exhaust valves and valve springs.

Manufacturer	Edelbrock
Application	Application Specific
UPC	085347610259
Series	Performer RPM
Quantity	Sold Individually
Availability Note	Available to Order
Warranty	12 Months
Horsepower	450-600 HP
Intake Valve Diameter	2.150 in
Guide Plate Material	Hardened Steel
Seat Angle	Exhaust 60 deg/Intake 60 deg
Emissions Code
Application Summary	Oldsmobile:Big-Block:400 (6.6L)/425 (7.0L)/455 (7.5L)

 

Intake Runner Volume	218 cc
Material	Aluminum
Push Rod Diameter	(Suggested) 0.375 in
Rocker Stud Diameter	0.4375 in
Valve Angle	6 Degree
Valve Spring Diameter	1.105 in
Valve Spring Maximum Lift	0.600 in
Valve Stem Diameter	0.3438 in