AFR's Best of Both Solution
Are you looking for big torque and big horsepower numbers? Our 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 the moderately sized intake runners producing tremendous flow figures across the entire lift range. 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, these aluminum 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 cylinder 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). The 325cc 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 115cc's on our 325 “As Cast” pieces, while the CNC Chamber 325 version comes with a 121cc chamber. 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.

Basic Package Components	Part #
5-angle valve job
Intake Valve, 2.300" stainless steel	AFR #7626
Exhaust Valve, 1.880" stainless steel	AFR #7631
1.625 O.D. Solid Roller PAC Racing Spring, 275lbs on seat, .850 Maximum Lift	AFR #8031
10° Chrome Moly Retainer	AFR #8518
10° Valve Locks	AFR #9005
Guide Plates	AFR #6109
Viton Valve Seals	AFR #6611
Hardened Spring Cup	AFR #8046
Intake Valve Seats	AFR #9062
Exhaust Valve Seats	AFR #9064
AFR BB Chevy 7/16 Exhaust Studs	AFR #6406
AFR BB Chevy 7/16 Intake Studs	AFR #6407

Specifications, Features, and Optional Supporting Components

Head Torque	75 ft. lbs
Intake Port Gasket, 1.720" x 2.450" with 1/2" radius, Fel-Pro #1211	AFR #6855
Exhaust Port Gasket	AFR #6858
Head Gasket	AFR #6850
Head Studs	AFR #6307
Head Bolts	AFR #6308
Head Bolt Washers	AFR #6320
Stud Girdle	AFR #6210
Suggested Manifold	Dart #6200, #6201, & #6203
Suggested Manifold	Brodix HVH #2000, #2001, #2005, & #2006
Spark Plug Starting Range	Champion C59C Autolite 3932
Combustion Chambers	115cc As Cast, 121cc w/ CNC Chambers
Spring Pocket	Can be cut to 1.750, no deeper
Valve Spacing	Standard
Rocker Arms	Standard
Valve Angle	24°/4° Intake, 15°/4° Exhaust
Angle Mill (Milling options available) 104cc max	.009" per cc
Flat Mill (Milling options available) As Cast 108cc max, CNC 114cc max	.006" per cc

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. Angle mills might require a .120 thick intake gasket.