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.
Specifications:
| Description_ABR |
CylinderHead |
| Description_ASM |
Oldsmobile:Big-Block:400 (6.6L)/425 (7.0L)/455 (7.5L) |
| Description_DEF |
Engine Cylinder Head |
| Description_EXT |
The Edelbrock #61025 Performer RPM Cylinder Head for 1965-76 Oldsmobile 400, 425 and 455 CID V8 engines is a perfect performance upgrade for big-block Olds-powered street machines and muscle cars. |
| Description_INV |
Performer RPM Cylinder Head for Olds |
| Description_LAB |
Performer RPM Cylinder Head #61025 for Oldsmobile Big Block |
| Description_MKT |
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. |
| Description_TRA |
Performer RPM #61025 heads are equipped with springs for use in hydraulic roller camshaft applications and intended for installation on 1965-76 Oldsmobile 400-455 CID big-block engines with a deck height of 10.625 inches. These heads will fit on Oldsmobile small-block engines but the 77cc chamber size will lower compression and is not ideal for performance. |
| Guide Material |
Manganese Bronze |
| Deck Thickness |
0.625 |
| Camshaft Type |
Hydraulic Roller |
| RGL |
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. |
| Exhaust Runner Volume |
128 |
| Guide Plate Material |
Hardened Steel |
| Valve Spring Maximum Lift |
0.600 |
| Exhaust Valve Diameter |
1.680 |
| EGR Port |
No |
| Valve Springs Included |
Yes |
| Seat Material |
Ductile Iron |
| Head Casting Number |
N/A |
| Material |
Aluminum |
| Guide Plates Included |
Yes |
| Horsepower |
450-600 |
| Series |
Performer RPM |
| Combustion Chamber Volume |
77 |
| Push Rod Diameter |
(Suggested) 0.375 |
| Family |
Performer RPM |
| Retainer Included |
Yes |
| Valve Stem Diameter |
0.3438 |
| Intake Runner Volume |
218 |
| Construction Type |
Complete |
| Exhaust Port Location |
Standard |
| Seat Angle |
Exhaust 60 deg/Intake 60 |
| Valve Included |
Yes |
| Valve Spring Diameter |
1.105 |
| Quantity |
Sold Individually |
| Valve Angle |
6 |
| Grade Type |
Performance |
| Intake Valve Diameter |
2.150 |
| CNC Ported |
No |
| Rocker Arm Stud Diameter |
0.4375 |
| Length |
8.0000 |
| Width |
17.0000 |
| Height |
25.0000 |
| Weight |
34.0000 |
