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- Edelbrock Performer RPM Aluminum Cylinder Heads for Big Block Chevy
Edelbrock Performer RPM High Compression 454-O Cylinder Heads for Big Block Chevy
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Performer RPM High Compression Aluminum Cylinder Heads - Oval Port
Designed for big-block Chevy 396-502 c.i.d. engines, these oval port heads feature 100cc semi-open combustion chambers created by angle milling at a 1.5 degree angle to improve intake port alignment and create a smaller chamber without valve shrouding. Using stock flat top style pistons they create an ideal street compression ratio of 9.2:1 without the need to purchase aftermarket domed pistons. A totally unique intake port design yields flow numbers traditionally associated with high performance rectangular port heads, but with the smaller runner size and velocity of an oval port for excellent seat-of-the-pants performance and crisp throttle response. The stainless steel 2.19'' intake and 1.88'' exhaust valves have smaller-than-stock 11/32'' valve stems to promote excellent flow and lighter valve weight. The deck surface and water jackets were specially designed to work with all big-block Chevrolet engine blocks. The heat crossover passage is present, but has been blocked, making these heads not legal for use on emissions controlled engines. Heads include top-quality ARP rocker studs, bronze guides and hardened, ductile iron valve seats.
Tech Tip: To gain more spark plug clearance, Edelbrock recommends using Champion RC Series plugs such as the RC12YC (P/N 192-49776). They are 0.230'' shorter than a conventional spark plug and have a 5/8'' hex for easier access.
| 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: | 0.700'' |
| Rocker Stud: | 7/16'' |
| Guideplate: | Hardened Steel 3/8'' |
| Pushrod Diameter: | 3/8'' |
| Valve Angle: | 26° |
| Exhaust Port Location: | Stock |
| Spark Plug Fitment: | 14mm x 3/4'' Reach, Gasket Seat |
| Valve Lift | Intake | Exhaust |
| .100'' | 73 | 71 |
| .200'' | 143 | 128 |
| .300'' | 207 | 153 |
| .400'' | 251 | 178 |
| .500'' | 284 | 200 |
| .600'' | 299 | 218 |
| .700'' | N/A | N/A |
| Flow Numbers as tested by Edelbrock's SuperFlo SF-1020 flow bench @ 28'' H2O | ||
Specifications:
Edelbrock Performer RPM Oval Port Cylinder Heads
These oval port heads will support over 540 hp with 9.5:1 compression when used as part of the Edelbrock Total Power Package. The 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. The semi-open chamber design maximizes efficiency with streetable compression ratios and the smaller-than-stock 11/32'' valve stems promote excellent flow and lighter valve weight.
Edelbrock Performer RPM High Compression Oval Port Cylinder Heads
These oval port heads are similar to the ones above with 100cc semi-open combustion chambers created by angle milling at a 1.5 degree angle to improve intake port alignment and create a smaller chamber without valve shrouding. They create an ideal street compression ratio of 9.2:1 when used with flat top pistons. Smaller-than-stock 11/32'' valve stems promote excellent flow and lighter valve weight.
Edelbrock Performer RPM Rectangle Port Cylinder Heads
These rectangle port heads are designed for street/high-performance big-blocks operating from 2500-7000 RPM. The specially designed ports offer increased flow and velocity over standard big-block heads. These heads feature highly-efficient 118cc open-style combustion chamber and high-velocity 315cc long/300cc short intake ports. Smaller-than-stock 11/32'' valve stems promote excellent flow and lighter valve weight.
Marine Performer RPM Cylinder Heads
The Marine Performer RPM heads feature heavy-duty, 1.89'' Inconel exhaust valves that provide added durability for marine applications. They are hard anodized to protect the aluminum in the harsh marine environment. These heads use smaller-than-stock 11/32'' valve stems to promote excellent flow and lighter valve weight. Match them with an Edelbrock Performer RPM manifold, Performer Series 750 cfm marine carb and Performer RPM cam for proven high-performance!
| Oval Port | Rectangle Port | |
| Combustion Chamber Volume | 110cc (Standard) 100cc (High Compression) | 118cc |
| Intake Runner Volume | 290cc | 315cc |
| Exhaust Runner Volume | 110cc | 110cc |
| Intake Valve Diameter | 2.19" | 2.19" |
| Exhaust Valve Diameter | 1.88" | 1.88" |
| Valve Stem Diameter | 11/32" | 11/32" |
| Valve Guides | Manganese Bronze | Manganese Bronze |
| Deck Thickness | 9/16" | 9/16" |
| Valve Spring Diameter | 1.55" | 1.55" |
| Valve Spring Maximum Lift | .700" | .700" |
| Rocker Stud | 7/16" | 7/16" |
| Guideplate | Hardended Steel | Hardended Steel |
| Pushrod Diameter | 3/8" | 3/8" |
| Valve Angle | 26° | 26° |
| Exhaust Port Location | Stock | Stock |
| Spark Plug Fitment | 14mm x 3/4 reach, gasket seat | 14mm x 3/4 reach, gasket seat |
| Made In USA! | ||
I have a set of 1968 closed chamber oval port heads (3917215) on my 454 with a Flat Tappet 292/292, Lift .550/.550 Cam. . .Would these Performer RPM Heads work or give me any horsepower increase?
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