AFR`s 335cc heads are designed feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. Recommended for radical street/strip or "Pro Street" builds with displacements up to 572 cubic inches, operating up to 7000 RPM. Component upgrades and machining options are available to customize AFR Heads to your specific build.
AFR's Best of Both Solution
Are you looking for big torque and big horsepower number? AFR's BB
Chevy line of medium volume intake runners will provide you with
exactly that. The phrase "having your cake and eating it to" would
certainly be appropriate with their moderately sized intake
runners producing tremendous flow figures across the entire lift
range (Our CNC 335 flows 410 CFM!). These high flow/high velocity
ports provide extreme versatility and fill the needs of many
applications. From a max-effort high compression 454 to a 605 CID
low rpm marine application, either one of these cylinder heads
would be a great choice. These heads would also be ideal in a
larger cubic inch "Pro-Street" application with their broad torque
range, as well as significant rpm and horsepower capability. These
heads will work best with a primary operating range of 3000-7000
rpm’s (This range is an average and will vary with engine
displacement as well as component selection). These 335cc heads
come standard with AFR’s trademark .750" thick head deck,
reinforced rocker stud bosses, 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 335cc
BBC. Properly selecting the correct cylinder head for an
application 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.
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
|
Manley 10° Steel
Retainers 1.500" O.D x 1.168" I.D x .844" I.D |
AFR #8518
|
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
#6853
(.120"
Thick)
or AFR
#6855 (.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 w/ CNC Chambers |
Valve
Spring Pocket Diameter |
style="float: right;">1.725 O.D
|
Intake Port Dimension |
2.455"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">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.
Note: color="#000000" face="Arial">Angle mills might require
a .120" thick intake gasketcolor="#000000" face="Arial">. Angle mills might require a
.120 thick intake gasket.
