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Performer (1986 and earlier)
These Performer cylinder heads are designed for 302, 327, 350 and 400 cid small-block Chevy engines up to 1986. These cylinder heads include your choice of 64cc (In order to retain stock compression ratio on 1970 and earlier small-blocks) or 70cc combustion chambers and high flow intake and exhaust ports. Complete heads include larger-than-stock 1.46" valve springs to handle most high-lift cams. These heads retain the stock intake port location for compatibility with standard manifolds and headers. Heat crossover is machined for 50-state emissions legal performance.
Performer Small-Block Chevy Cylinder Head Specifications |
| Combustion chamber volume |
64cc & 70cc |
| Intake runner volume |
185cc |
| Exhaust runner volume |
65cc |
| Intake valve diameter |
2.02" |
| Exhaust valve diameter |
1.60" |
| Valve stem diameter |
11/32" |
| Valve guides |
Manganese bronze |
| Deck thickness |
5/8" |
| Valve spring diameter |
1.46" |
| Valve spring maximum lift |
0.575" |
| Rocker stud |
3/8" |
| Guideplate |
Hardened steel |
| Pushrod diameter |
5/16" |
| Valve angle |
23° |
| Exhaust port location |
Stock |
| Spark plug fitment |
14mm x 3/4 reach, gasket seat |
| Made In |
USA |
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Technical Notes: Sold individually. Requires the use of hardened push rods. Bare heads will have valve guides and seats installed, but will require final sizing and valve job to match the valves you will be using. To use stock stamped steel rockers on small-block Chevy heads, +.100" longer than stock Edelbrock pushrods #9629 or equivalent are required. Small-block Chevy heads may not be used on engines with less than a 4.00" bore except with camshafts with less than .450" valve lift. |
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| Description |
Bare (Single) |
Complete (Single) |
| Street Legal Performer (70cc) |
60659 |
60759 |
| Street Legal Performer (64cc) |
N/A |
60909 |
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Flow Numbers as tested by Edelbrock's SuperFlo SF-1020 flow bench @ 28" H2O
| #60759 |
| Valve Lift |
.100" |
.200" |
.300" |
.400" |
.500" |
.600" |
.700" |
| Intake |
66 |
127 |
185 |
230 |
238 |
239 |
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| Exhaust |
52 |
97 |
127 |
146 |
156 |
162 |
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AMC
Small Block
