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Performer RPM 348/409
- Designed for 1961-1965 Chevrolet "W" series 348/409 big-block engines
- Original port locations and valve angles for bolt-on convenience
- CNC port matched 220cc intake and 115cc exhaust ports for optimum flow and power
- Improved port design for more performance
- Hardened spring cups, screw-in rocker studs and hardened guideplates
Cylinder Head Specifications |
| Combustion chamber volume |
N-a |
| Intake runner volume |
215cc |
| Exhaust runner volume |
115cc |
| Intake valve diameter |
2.19" |
| Exhaust valve diameter |
1.72" |
| Valve stem diameter |
11/32" |
| Valve guides |
Manganese bronze |
| Deck thickness |
9/16" |
| Valve spring diameter |
1.55" |
| Valve spring maximum lift |
.600" |
| Rocker stud |
7/16" |
| Guideplate |
Hardened steel |
| Pushrod diameter |
3/8" |
| Valve angle |
0 |
| Exhaust port location |
Stock |
| Spark plug fitment |
14mm x 3/4 reach, gasket seat |
| Made In |
USA |
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Technical Notes: Use Edelbrock head gasket sets. May be used on 348 engines with valve lifts
up to .550" only. Bare heads will have valve guides and seats installed, but will require final sizing and 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). These heads will only fit 1958-65 348 cid “W” engines if an Edelbrock #5409 or
stock large port 409 cid manifold is used. Proper cylinder wall notching must be checked to ensure exhaust
valve to cylinder clearance. |
| |
| Description |
Bare |
Complete |
| Performer RPM 348/409 |
60809 |
60819 |
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Flow Numbers as tested by Edelbrock's SuperFlo SF-1020 flow bench @ 28" H2O
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| Valve Lift |
.100" |
.200" |
.300" |
.400" |
.500" |
.600" |
.700" |
| Intake |
65 |
130 |
192 |
235 |
258 |
260 |
N-a |
| Exhaust |
52 |
96 |
127 |
163 |
182 |
190 |
N-a |
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AMC
Small Block
