AFR 305cc BBC Rectangle Port Cylinder Heads, Partially Ported, CNC Chambers

The Ultimate Race/Street Weapon!
For the ultimate in "Rectangle Port" performance, partially CNC ported, CNC chambers, this 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 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.

Basic Package Components	Part #
50% CNC Ported Exhaust Ports 20% CNC Ported Intake Ports 100% CNC Ported Combustion Chambers Competition 5-angle Valve Job
11/32" Intake Valve, 2.250" x 5.500" O.A.L	AFR #7620
11/32" Nail Head Exhaust Valve, 1.880" x 5.450" Overall Valve Length	AFR #7630
Manley 10° Steel Retainers 1.500" O.D x 1.168" I.D x .844" I.D	AFR #8518
PAC Racing Spring #1224 1.625 O.D. Solid Roller, 275lbs on seat, .850 Maximum Lift, Max RPM 7400-7600	AFR #8031
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 #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	Autolite 3932
Combustion Chambers	121cc w/ CNC Chambers or 117cc w/ As Cast Chambers
Valve Spring Pocket Diameter	1.725 O.D
Intake Port Dimension	2.380"H x 1.680"W x 11/32 Radius
Exhaust Port Dimension	1.720"H x 1.920" W
Valve Angle	24°/4° Intake, 15°/4° Exhaust
Angle Mill	.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. 1" longer head bolts needed on four bottom exhaust bolt holes. Angle mills might require a .120 thick intake gasket.