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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 1987-95 TBI-equipped 7.4L dished piston motors
- Performer applications include heat crossover passage for emissions related engines
- 50-state street legal
Cylinder Head Specifications |
| Combustion chamber volume |
100cc |
| Intake runner volume |
290cc |
| Exhaust runner volume |
110cc |
| Intake valve diameter |
2.19" |
| Exhaust valve diameter |
1.88" |
| Valve stem diameter |
11/32" |
| Valve guides |
Manganese bronze |
| Deck thickness |
9/16" |
| Valve spring diameter |
1.55" |
| Valve spring maximum lift |
.700" |
| Rocker stud |
7/16" |
| Guideplate |
Hardened steel |
| Pushrod diameter |
3/8" |
| Valve angle |
26° |
| Exhaust port location |
Stock |
| Spark plug fitment |
14mm x 3/4 reach, gasket seat |
| Made In |
USA |
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Technical Notes: Match with Edelbrock head gasket sets. Bare heads will have valve guides and seats installed, but will require final sizing & a valve job to match the valves you will be using. Recommended spark plugs 14mm x 3/4" reach with flat gasket seat (Champion RC12YC). |
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| Description |
Bare (Single) |
Complete (Single) |
| Performer high-compression 454-0 |
60489 |
60499 |
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Flow Numbers as tested by Edelbrock's SuperFlo SF-1020 flow bench @ 28" H2O
| #60499 |
| Valve Lift |
.100" |
.200" |
.300" |
.400" |
.500" |
.600" |
.700" |
| Intake |
73 |
143 |
208 |
251 |
284 |
299 |
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| Exhaust |
71 |
128 |
153 |
178 |
200 |
218 |
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AMC
Small Block
