- Engines & Components
- Cylinder Heads
- AFR Big Block Chevy 377cc Rectangle Port Magnum Aluminum Cylinder Heads
AFR's 377cc Monster Cylinder Head!
AFR 377's are ideal for large cubic inch combinations, 540-615ci, that are looking for more airflow but want to retain a 2.300'' intake valve. This head will also work well on smaller very aggressive applications, like 489-532ci engines turning over 8000 RPM's. The 377 is very efficient and moves a lot of air early in the curve (415 @ .600'') making it an ideal choice if you're limited to how much cam lift you can run, such as a big inch marine engine with a hydraulic roller cam and a limited RPM ceiling. With close to 440cfm of peak flow, it should be extremely easy to clear 950HP in a single four barrel aggressive applications and even more in well sorted out combinations (especially with tunnel ram/sheet metal dual quad combo's).
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The exhaust ports are also notably stronger making the 377 an excellent choice in a forced induction or nitrous car that could benefit from the stronger exhaust flow. Of course the 377cc comes standard with AFR's trademark .750'' (3/4'') thick cylinder head deck, reinforced rocker stud bosses, premium one-piece stainless steel 2.300'' intake valves and 1.880'' exhaust valves. Standard combustion chamber volume is 121cc for the 377cc BBC. Take note the higher flowing exhaust ports and bolt pattern are raised .375'' (3/8'') over stock location, this rarely affects header or chassis fitment. .
Installation Notes: Optional stud girdle required for 2° rolled valve angles and 1'' longer head bolt needed on four bottom exhaust bolt holes. Longer pushrods may also be required.
377cc Rectangle Port Magnum Cylinder Head Features:
- 100% CNC Ported Combustion Chambers
- 100% CNC Ported Exhaust Ports
- 100% CNC Ported Intake Ports
- Competition 5-angle Valve Job
- 377cc Intake Ports
- Intake Valve, 2.300'' x 5.500'' Overall Valve Length
- Exhaust Valve, 1.880'' x 5.442'' Overall Valve Length
- 1.625'' OD PAC Racing Solid Roller Valve Spring, 275 lbs on seat, .850'' maximum lift
- 10° Titanium Retainers
- 10° Chrome Moly Valve Locks
- 7/16'' Rocker Studs
- Adjustable 3/8'' Guide Plates
- Viton Valve Seals
- Hardened Spring Seats
- Intake Valve Seats
- Exhaust Valve Seats
- Bronze Valve Guides