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Edelbrock Cylinder Heads - BB Chevy Street

Performer RPM 454-O Designed for big-block Chevy 396-502 c.i.d. engines, these oval port heads will support over 540hp with 9:5:1 compression when used as part of the Total Power Package. Our unique intake port design produces flow close to rectangular port heads, but with the smaller port size and velocity of an oval port for excellent seat-of-the-pants performance and crisp throttle response. The semi-open chamber design maximizes combustion efficiency with streetable compression ratios. 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. Heads include top quality ARP rocker studs, bronze guides and hardened, ductile iron valve seats.

Performer RPM 454-O Oval Port Heads Part # Item Description Price/Pair 6045 Performer RPM Assembled Heads, 110cc $1709.99 60451 Polished Performer RPM Assembled Heads, 110cc $1849.99

Performer 454-O Performer 454-O cylinder heads have the same outstanding features as the Performer RPM heads but with an exhaust crossover passage for a 50-state emissions legal status (E.O. #D-215-46). Match these powerful heads with our Performer manifold, Performer-Plus cam and an Edelbrock square-bore or spread-bore carburetor for a Power Package that's capable of over 470 ft/lbs. of torque at 3500 rpm.

Performer 454-O Oval Port Heads Part # Item Description Price/Pair 6047 Performer Assembled Heads 110cc $1709.99

Performer RPM 454-R Performer RPM rectangular-port heads have specially designed intake and exhaust ports for increased flow and velocity over standard big-block heads.  These heads feature a highly-efficient 118cc open-style combustion chamber and high-velocity 315cc long/300cc short intake ports.  Designed for street/high-performance big-blocks operating from 3500-6500 rpm.  Stainless steel, hardened tip 2.19" intake/1.88" exhaust valves have 11/32" valve stems for excellent flow and lighter weight.  The deck surface and water jackets work with all generations of big-block Chevy blocks.  Heads include top-quality ARP rocker studs, bronze guides and hardened, ductile iron valve seats.

Performer RPM 454-R Rectangular Port Heads Part # Item Description Price/Pair 6055 Performer RPM 454-R Assembled 118cc $1709.99 60551 Polished Performer RPM 454-R Assembled 110cc $1849.99

Performer High-Compression 454-O Designed for 396, 427 & 454(7.4L) c.i.d. engines, these 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.  The 100cc combustion chambers are coupled with the same size valves and ports as the #6045 Performer RPM heads, producing 9:2:1 compression with flat-top pistons for an outstanding high performance street head. When used on 1987-up TBI equipped 7.4L dished piston motors they produce an 8.8:1 compression ratio and made over 450ft/lbs torque when combines with our Multi=Point EFI System. The heads also feature an exhaust crossover passage for 50-state emission legal status (EO #D-215-46).  Available assembled with high quality components: one piece stainless steel, 2.19" intake and 1.88" exhaust valves: ARP 7/16" diameter rocker studs, bronze guides and ductile iron seats with 3-angle valve job.  Features stock port locations, 9/16" deck thickness and heli-coils in the rocker stud and exhaust bolt holes.  Mark IV rocker arms and valve train parts required.

Performer High-Compression 454-O Part # Item Description Price/Pair 6049 Performer High-compression 454-O Assembled 100cc $1749.99

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