AFR 385cc Fully CNC Ported Magnum BBC Cylinder Heads

Sale: $3,786.28
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AFR 385cc Fully CNC Ported Magnum BBC Cylinder Heads

AFR’s Magnum Series

BBC 385cc Fully CNC ported Cylinder Heads
Click to enlarge

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 (Ti valves recommended over 8000 RPM’s). This head will be best utilized with camshafts in the .780 - .850 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, reinforced rocker stud bosses, and is equipped with 2.350 intake / 1.880 tulip exhaust valves. 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.


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.(see footnotes here)


AFR 385cc BBC CNC Aluminum Cylinder Head Flow Chart

Tested on a 4.600 Bore

385 BBC Cylinder Head Flow Chart

Basic Package Components
100% CNC Ported Intake Ports, Exhaust Ports, & Combustion Chamber
Competition 5-angle Valve Job
AFR #7627Intake Valve, 2.350" stainless steel
AFR #7631Exhaust Valve, 1.880" stainless steel
AFR #80311.625 O.D. Solid Roller PAC Racing Spring #1224, 275lbs on seat, .850 Maximum Lift
AFR #850710° Titanium Retainer
AFR #900510° Valve Locks
AFR #6109Guide Plates
AFR #6611Viton Valve Seals
AFR #8046Hardened Spring Cup
AFR #9062Intake Valve Seats
AFR #9064Exhaust Valve Seats
AFR #9045Bronze Valve Guides Intake
AFR #9046Bronze Valve Guides Exhaust
AFR #6406AFR BB Chevy 7/16 Exhaust Studs
AFR #6407AFR BB Chevy 7/16 Intake Studs

Specifications, Features, and Optional Supporting Components
75 ft. lbs.Head Torque
AFR #6856Intake Port Gasket, 1.720" x 2.450" with 1/2" radius, Fel-Pro #1275
Important: Do not port match your intake manifold to Fel-Pro gasket as it does not precisely fit AFR heads.
AFR #6858Exhaust Port Gasket
AFR #6850Head Gasket
Mark V-VI-up to 4.500 Bore Fel-Pro #17048 or #1047Head Gasket
Mark V-VI-4.500 to 4.600 Bore Fel-Pro #17049Head Gasket
AFR #6306Head Bolts
AFR #6307Head Studs
AFR #6308Head Bolts
AFR #6320Head Bolt Washers
AFR #6210Stud Girdle
AFR #5500Suggested Manifold
Edelbrock #2927Suggested Manifold
Dart #6200, #6201, & #6203Suggested Manifold
Brodix HVH #2000, #2001, #2005, & #2006Suggested Manifold
Champion C59C Autolite 3932Spark Plug Starting Range
121ccCombustion Chambers
Can be cut to 1.750, no deeperSpring Pocket
StandardValve Spacing
StandardRocker Arms
24°/4° Intake, 15°/4° ExhaustValve Angle
.009" per ccAngle Mill (milling options available), 104cc Maximum
.006" per ccFlat Mill (milling options available), 114cc Maximum

Note: Milling head deck will affect flow numbers. Angle mills might require a .120 thick intake gasket.

Add to Cart:

  • Model: 2020
  • Shipping Weight: 95lbs