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| CYLINDER HEADS - Chevrolet - Big Block - Performer |
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| Street High-Performance Heads |
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PERFORMER & PERFORMER RPM 454-O
- These oval port heads will support over 540 hp with 9.5:1
compression when used as part of the Total Power Package
- Unique oval intake port shape produces flow similar to
rectangular ports, but the smaller port size provides excellent
seat-of-the-pants performance and crisp throttle response
- Semi-open chamber design maximizes efficiency with streetable compression ratios
- Smaller-than-stock 11/32" valve stems promote excellent flow and lighter valve weight
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| PERFORMER 454-O |
| Chamber Size |
Intake Port Size |
Valve Sizes (in/ex) |
Bare (single) |
Complete (single) |
| 110cc |
290cc |
2.19"/1.88" |
#60469 |
#60479 |
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PERFORMER HIGH-COMPRESSION 454-O
- 100cc semi-open chamber heads feature a 1-1/2° rolled
over (angle milled) design that improves intake port
alignment and provides a smaller combustion chamber
without shrouding the valves
- 9.2:1 compression with flat-top pistons for an outstanding high performance street head
- 8.8:1 compression ratio when used on 1987-up TBI-equipped 7.4L dished piston motors
- Produced over 450 ft/lbs. torque when combined with our Multi-Point EFI System
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| PERFORMER HIGH-COMPRESSION 454-O |
| Chamber Size |
Intake Port Size |
Valve Sizes (in/ex) |
Bare (single) |
Complete (single) |
| 100cc |
290cc |
2.19"/1.88" |
#60489 |
#60499 |
 Note: See the Cylinder Heads Chart for specs. Mark IV rocker arms and valvetrain parts required. |
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AMC
Small Block
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