AFR's 377cc heads feature 100% CNC ported intake, exhaust & chambers, 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.
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, PAC 1.625 racing springs
rated to .850 lift, and are equipped with premium one piece
stainless steel 2.300" intake valves and 1.880" exhaust valves.
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.
color="#ffffff" size="4">Basic Package Components |
color="#ffffff" size="4">Part # |
100% CNC Ported Chambers,
Exhaust, and Intake
Competition 5-angle Valve
Job |
|
11/32" Intake Valve,
2.300" x5.500" O.A.L |
AFR #7626 |
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 |
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 |
2.450"H
x
1.755"W x 13/32 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.
