AFR 385cc BBC Magnum Cylinder Heads, 100% CNC Ported, Titanium Retainers

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, 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.

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.

Basic Package Components	Part #
100% CNC Ported Chambers, Exhaust, and Intake Competition 5-angle Valve Job
11/32" Intake Valve, 2.350" x 5.500" O.A.L	AFR #7627
11/32" Nail Head Exhaust Valve, 1.880" x 5.450" Overall Valve Length	AFR #7631
PAC Racing Spring #1224 1.625 O.D. Solid Roller, 275lbs on seat, .850 Maximum Lift, Max RPM 7400-7600	AFR #8031
10° Titanium Retainer 1.500" O.D x 1.180" I.D x .765" I.D	AFR #8507
10° 11/32" Valve Locks with lashcap recess	AFR #9005
ARP 7/16" Rocker Exhaust Studs	AFR #6406
ARP 7/16" Rocker Intake Studs	AFR #6407
Adjustable 3/8" Guide Plates	AFR #6109
11/32" Viton Valve Seals	AFR #6611
Hardened Spring Cup 1.740" O.D / 1.650" I.D	AFR #8046
Intake Valve Seats 2.450" O.D x 2.000" I.D x .375" Deep	AFR #9062
Exhaust Valve Seats 2.000" O.D x 1.580" I.D x .375" Deep	AFR #9064
11/32" Intake Bronze Valve Guides .531" O.D x 2.10" O.A.L	AFR #9045
11/32" Exhaust Bronze Valve Guides .531" O.D x 2.25" O.A.L	AFR #9046

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.