AFR's 305cc rectangle port heads feature partially ported with no parts, A356 aluminum castings and high quality components throughout. Recommended for moderate street, or street/strip builds with displacements up to 509 cubic inches, operating up to 6500 RPM. Also available with 100% CNC chambers for increased air flow (see chart). Component upgrades and machining options are available to customize AFR Heads to your specific build.
The Ultimate Race/Street Weapon!
For the ultimate in "Rectangle Port" performance, available in
partial or full CNC ported, AFR 305 has no competition. With flow
figures most small to medium sized rectangular port castings would
be envious of, these high flowing "Rectangle" produce tremendous
airspeed and really pack a punch. AFR has included it's trademark
3/4" deck, reinforced rocker stud bosses, and thick rugged castings,
so you can own the strongest and most efficient heads on the market
today. Premium hardware all come as standard equipment. Take note
the higher flowing exhaust ports are raised .375 over stock
location, and therefore these heads might not be a direct bolt-on in
every application. These heads have no EGR, no parts and are not
emissions legal.
Note:
1" longer head bolts needed on four bottom exhaust bolt holes.
Angle
mills
might require a .120" Thick intake gasket.
color="#ffffff" size="4">Basic Package Components |
color="#ffffff" size="4">Part # |
50% CNC
Ported Exhaust Ports
20% CNC Ported Intake Ports
30% CNC Ported Combustion Chambers
Competition 5-angle Valve Job |
|
color="#ffffff" size="4">Specifications, Features, and
Optional Supporting Components |
Head Torque |
75 ft. lbs
|
Intake Port Gasket |
AFR
#6853 (.120" Thick) or style="float:right;">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 or 117cc w/ As Cast Chambers |
Valve
Spring Pocket Diameter |
style="float: right;">1.725 O.D
|
Intake Port Dimension |
2.380"H
x
1.680"W x 11/32 Radius |
Exhaust
Port Dimension |
style="float:right;">1.720"H x 1.920" W |
Valve Angle |
24°/4°
Intake,
15°/4° Exhaust |
Angle Mill
|
style="float:right;">.009" per cc/ Maximum 104cc as cast
or CNC Chamber |
Flat Mill
|
.006"
per
cc/ Maximum 108cc as cast or 114cc CNC Chamber |
Stud
Girdle, (AFR Specific) |
AFR #6202 |
Important: Do not port
match you intake manifold to any Fel-Pro gasket as it does not
precisely match AFR heads.
Note: Milling head deck will affect flow numbers. color="#000000" face="Arial">1" longer head bolts needed on
four bottom exhaust bolt holes. Angle mills might require a
.120 thick intake gasket.
