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The smallest intake volume runners in our line-up, but don't let size fool you. Our 305cc “As Cast” with CNC bowl blend or fully CNC ported 315cc cylinder heads will provide you with flow numbers most medium sized heads, and some larger, can only dream about. This line was designed to optimize low and mid-lift airflow, while still generating impressive peak figures. Their application should be focused on smaller cubic inch Big Blocks (396-502), with a primary operating range of 2500-6800 rpm's (this range is an average and will vary with engine displacement as well as component selection). These heads should also be given strong consideration in larger street driven or marine applications up to 555 CID, where low rpm power and drivability are a factor. The 315 version is extremely versatile with its incredibly strong low and midlift airflow figures as well as peak numbers approaching the 400 CFM mark. Either one of these two cylinder heads would be a great choice if your looking for big torque, strong low rpm performance, and still have good rpm capabilities. Both the 305cc and the 315cc come standard with AFR's trademark .750” thick head deck, reinforced rocker stud bosses, and are equipped with premium one piece stainless steel 2.250” intake valves and 1.880” exhaust valves. Standard combustion chamber volume is 119 cc's on the 305 “As Cast” pieces, while our fully CNC ported 315cc version comes with a 121cc chamber. Both are available with an optional 114cc combustion chamber as well.
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 help 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.
| Basic Package Components |
Part # |
| Competition 5 angle valve job |
|
| Intake Valve, 2.250" stainless steel |
AFR #7620 |
| Exhaust Valve, 1.880" stainless steel |
AFR #7630 |
| 1.625 O.D. Roller Dual Valve Spring with dampener, 255 lbs. on seat, .750" maximum lift |
AFR #8031 |
| 10° Chrome Moly Retainer |
AFR #8511 |
| 10° Valve Locks |
AFR #9005 |
| Guide Plates |
AFR #6109 |
| Valve Seals |
AFR #6611 |
| Hardened Shims |
AFR #8046 |
| Intake Valve Seats |
AFR #9062 |
| Exhaust Valve Seats |
AFR #9064 |
| Bronze Valve Guides Intake |
AFR #9045 |
| Bronze Valve Guides Exhaust |
AFR #9046 |
| AFR BB Chevy 7/16 Exhaust Studs |
AFR #6406 |
| AFR BB Chevy 7/16 Intake Studs |
AFR #6407 |
All Accessory Holes are Predrilled & Tapped! |
