AFR 24° BBC Cylinder Head 315cc Fully CNC Ported, 121cc Chambers, Competition Package

The AFR 315cc BBC Rectangle Port Cylinder Head is designed for aggressive street or street/strip applications with engine displacements up to 540 cubic inches, operating at or below 6800 RPM. Featuring fully CNC-machined intake runners, exhaust ports, and combustion chambers, these heads deliver exceptional performance and flow. Capable of flowing 387 CFM at 0.800" lift, this competition package ensures maximum power and efficiency.

Included Components

100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
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" O.A.L (AFR #7630)
PAC Racing #1224 1.625” OD Solid Roller Dual Valve Spring – 275 lbs. on seat, .850” max lift, Max RPM 7400-7600 (AFR #8031)
10° Steel Retainers 1.500" O.D x 1.168" I.D x .844" I.D (AFR #8518)
10° 11/32” Valve Keepers with lashcap recess (AFR #9005)
ARP 7/16” Rocker Studs Intake (AFR #6407)
ARP 7/16” Rocker Studs Exhaust (AFR #6406)
Adjustable 3/8" Guide Plates (AFR #6109)
11/32" Viton Valve Seals (AFR #6613)
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 #9065)
Exhaust Valve Seats 2.000" O.D x 1.580" I.D x .375" Deep (AFR #9064)
11/32" Intake Bronze Valve Guides .502" O.D x 2.10" O.A.L (AFR #9041)
11/32" Exhaust Bronze Valve Guides .502" O.D x 2.25" O.A.L (AFR #9042)

Performance Flow Chart

Lift (inches)	.200	.300	.400	.500	.600	.700	.800
Intake (CFM)	163	239	301	349	380	386	387
Exhaust (CFM)	138	184	238	271	285	293	299

Technical Specifications

Material: A356 Aluminum
Intake Port Volume: 315cc
Exhaust Port Volume: 135cc
Combustion Chamber Size: 121cc (Fully CNC Ported)
Valve Angle: 24°/4° Intake, 15°/4° Exhaust
Deck Thickness: .750"
Minimum Bore Diameter: 4.250"

CARB Compliance Notice

This product is illegal for use on any public roadway. It is intended for dedicated racing vehicles only. Violations are subject to fines and penalties.