Afr 385cc Bbc Magnum Cylinder Heads, 100% Cnc Ported, No Parts

The 385cc heads are AFR's largest and best flowing BBC heads! They 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+) high RPM Big Block Chevrolet racing engines. Component upgrades and machining options are available to customize AFR Heads to your specific build.
The Largest And Highest Flowing BBC Head Ever Made! As the aftermarket continues to push larger displacement combinations, even 555 CID BBC’s are becoming commonplace with 600+ CID engines more plentiful than ever before. AFR is proud to announce our answer to that with our all new 385 cc Magnum, the largest and highest flowing BBC product in our line-up with flow numbers that are creeping up on many of our competitor’s 18 degree Pro-stock style heads. If you’ve got the displacement we have the head to feed it with an intake port that flirts with 440 CFM at a usable lift-point, and enough complimenting exhaust flow to still maintain over 75% of that number @ .800 lift (335 CFM’s at .800 lift!). While this huge a runner is more clearly aimed at 572 - 632 CID applications, in a light car it could still be considered in 555-565 CID aggressive builds that are built to reliably turn 7800 - 8500 RPM’s (Titanium valves recommended over 8000 RPM’s). This head will be best utilized with camshafts in the .780 - .850 lift range to take full advantage of its impressive higher lift airflow, but the best thing about this head is its ability to also provide the end user with industry leading low and mid-lift flow as well (400+ CFM at .600 lift!). This head of course comes with AFR’s trademark .750 thick head deck, and reinforced rocker stud bosses. Properly selecting the right cylinder head depends on a large number of variables. Please consult with one of our sales technicians to assist you in making the best choice 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 2.565"H x 1.810"W x 15/32 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.