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.
color="#ffffff" size="4">Basic Package Components |
color="#ffffff" size="4">Part # |
100% CNC Ported Chambers,
Exhaust, and Intake
Competition 5-angle Valve
Job |
|
color="#ffffff" size="4">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 |
style="float: right;">Autolite 3932 |
Combustion Chambers |
121cc
Full
CNC |
Valve
Spring Pocket Diameter |
style="float: right;">1.725 O.D
|
Intake Port Dimension |
2.565"H
x
1.810"W x 15/32 Radius |
Exhaust
Port
Dimension |
style="float:right;">1.780"H x 2.025" W |
Valve Angle |
24°/4°
Intake,
15°/4° Exhaust |
Angle Mill
|
style="float:right;">.009" per cc/Maximum 104cc |
Flat Mill
|
.006"
per
cc/
Maximum
114cc |
Stud
Girdle, (AFR Specific) |
AFR #6202
|
Important: color="#000000" face="Arial">Do not port match
your intake manifold to Fel-Pro gasket as it does not
precisely fit AFR heads.
Note: color="#000000" face="Arial"> 1" longer head bolts
needed on four bottom exhaust bolt holes.
