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AFR 377cc BBC Magnum Cylinder Heads, 100% CNC Ported, No Parts

AFR 3575
AFR's 377cc heads feature 100% CNC ported intake, exhaust & chambers, no parts, A356 aluminum castings, Titanium retainers, and high quality components throughout. These heads are best suited for large displacement (540+) Big Block Chevrolet racing engines. Component upgrades and machining options are available to customize AFR Heads to your specific build.
Shipping: FREE continental USA ground shipping on ALL AFR Cylinder Heads
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Sale: $4,177.66
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Description

Fully CNC Ported Magnum BBC Cylinder Heads! AFR 377's are ideal for large cubic inch combinations (540-615 CID) 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 (489-532 CID) 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 your 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 440 CFM of peak flow it should be extremely easy to clear 950 HP 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). 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" thick cylinder head deck, reinforced rocker stud bosses, and PAC 1.625 racing springs rated to .850 lift. Standard combustion chamber volume is 121cc for our 377cc BBC. Properly selecting the correct cylinder head depends on a large number of variables. Please consult with one of our sales technicians to assist you in making the best decision for your particular application.

Note: Optional stud girdle required for 2° rolled valve angles and 1" longer head bolts needed on four bottom exhaust bolt holes. Longer pushrods might also be required.
Important: Do not port match your intake manifold to Fel-Pro gasket as it does not precisely fit AFR heads.

Basic Package Components Part #
100% CNC Ported Chambers, Exhaust, and Intake
Competition 5-angle Valve Job

Specifications, Features, and Optional Supporting Components
Head Torque 75 ft. lbs
Intake Port Gasket AFR #6854 (.120" Thick) or AFR #6856 (.060" Thick)
Exhaust Port Gasket AFR #6858
Head Gasket, Fel-Pro #1047 (Mark V and VI) AFR #6849
Head Gasket, Fel-Pro #1017-1 (Mark IV) AFR #6350
Head Bolts, ARP 135-3703 (Mark IV) AFR #6306
Head Bolts, ARP 135-3707 (Mark V) AFR #6308
Head Studs, ARP 235-4713 AFR #6307
Head Bolt Washers, Manley AFR #6320
Suggested Manifold
Super Victor Victor Jr., 
Spark Plug Starting Range Autolite 3932
Combustion Chambers 121cc Full CNC
Valve Spring Pocket Diameter 1.725 O.D
Intake Port Dimension 2.450"H x 1.755"W x 13/32 Radius
Exhaust Port Dimension 1.780"H x 2.025" W
Valve Angle 24°/4° Intake, 15°/4° Exhaust
Angle Mill
.009" per cc/Maximum 104cc
Flat Mill
.006" per cc/ Maximum 114cc
Stud Girdle, (AFR Specific) AFR #6202
Important: Do not port match your intake manifold to Fel-Pro gasket as it does not precisely fit AFR heads. 
Note: 1" longer head bolts needed on four bottom exhaust bolt holes.

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Shipping Information

  • Item Requires Shipping
  • 80.0 lbs.
  • W24.0000” x H12.0000” x L24.0000”
  • Free Basic Shipping
  • This item ships in its own box.
  • FREE continental USA ground shipping on ALL AFR Cylinder Heads
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