AFR 357cc BBC Magnum Rectangle Port Cylinder Heads, Titanium Retainers, 100% CNC Ported

AFR's 357cc heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. Recommended for race applications or radical "Pro Street" builds with displacements up to 605 cubic inches. Component upgrades and machining options are available to customize AFR Heads to your specific build.






AFR's "As Cast" Magnum Series The Original "357" Magnum BBC
Cylinder Heads! If "Dirty Harry" drove a racecar, it would
certainly be fitted with a pair of AFR 357cc "Magnum" cylinder
heads. If huge horsepower is what you are searching for, either of
these castings will certainly deliver. With our fully CNC ported
357cc flowing 425 CFM it can produce upwards of 900 HP. These
cyilnder heads were targeted at larger cubic inch engines (509-632
CID) looking for maximum horsepower and rpm capability with a
primary operating range of 3500-8000 rpm’s (This range is an
average and will vary with engine displacement and component
selection). Also, these aluminum heads provide impressive torque
figures at higher rpm levels, so higher reving 450+ CIDs can
benefit from the efficient runner. Blown, turbo, and nitrous
engines will especially like the larger, higher flowing intake
ports. AFR BBC 357cc cylinder heads will work best with camshafts
exceeding .750 gross valve lift to make better use of the
substantial airflow found in the higher lift range. The 357cc come
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 357cc BBC and can be
milled as low as 102 cc's if necessary. 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.

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
Titanium 10 degree Retainer 1.490 OD x 1.115 ID x .745 ID for SBC/BBC	AFR #8505
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	style="float:right;">121cc Full CNC
Valve Spring Pocket Diameter	style="float: right;">1.725 O.D
Intake Port Dimension	2.520"H x 1.815"W x 11/32 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
gasket.

color="#000000" face="Arial">