Bare
Magnum 18 Degree 457 cc Big Block Chevy heads are ideal 540 ci and larger racing engines. Developed to be the highest flowing AFR Big Block Chevy cylinder head, the 457 cc head will require specific pistons, shaft mount rockers, intake manifold, and valve covers. Part #033-3707 is fully CNC ported and comes as a bare casting.
Basic Package Features
- A356 Aluminum Heads
- 100% CNC ported combustion chambers, exhaust ports, and intake ports
- Competition 5-angle valve job
- 90 cc combustion chambers
- 14 mm x 750 in. tapered seat spark plugs
- .750 in. deck thickness
- 4.600 in. minimum bore size
Intake Port Specs
- Volume: 457 cc
- Dimension: 2.490 in. H x 1.750 in. W x .500 in. Radius
- Location: .500 in. Raised
Exhaust Port Specs
- Volume: 143 cc
- Dimension: 1.850 in. H x 2.090 in. W
- Location: .450 in. Raised
Valve Guide Specs
- Intake: Bronze 502 in. OD x 2.700 in. OAL
- Exhaust: Bronze 502 in. OD x 2.250 in. OAL
Valve Specs
- Intake Valve Angle: 18 / 4 Degree
- Intake Valve Size: 2.400 in. x 6.035 in. OAL
- Intake Valve Seat: 2.500 in OD x 2.000 in. ID x .375 in. Depth
- Exhaust Valve Size: 1.800 in. x 5.935 in. OAL
- Exhaust Valve Seat: 1.900 in OD x 1.400 in. ID x .375 in. Depth
- Exhaust Valve Angle: 11 / 4 Degree
Flow Specifications
- .200 - 161 int. ; 134 exh.
- .300 - 254 int. ; 201 exh.
- .400 - 331 int. ; 251 exh.
- .500 - 389 int .; 286 exh.
- .600 - 439 int. ; 305 exh.
- .700 - 479 int. ; 315 exh.
- .800 - 492 int. ; 332 exh.
- .900 - 495 int. ; 337 exh.
- 1.000 - 498 int. ; 342 exh.
Specifications:
Motor Vehicles
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Tools:
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Electrical Cords
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