AFR 24° BBC Cylinder Head 377cc Fully CNC Ported, 121cc Chambers, Competition Package

The AFR 24° BBC 377cc Fully CNC Ported Cylinder Heads are designed for high-performance big block Chevy racing applications. Ideal for +540 cubic inch large displacement engines operating at or below 7600 RPM, these heads feature fully CNC-machined intake runners, exhaust ports, and combustion chambers. Equipped with titanium retainers and high-quality components, they deliver superior airflow, reaching 437 CFM at 0.900" of lift.

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, 2.300" x 5.500" O.A.L (AFR #7626)
11/32" Tulip Exhaust Valve, 1.880" x 5.450" O.A.L (AFR #7631)
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° Titanium Retainer 1.500" O.D x 1.180" I.D x .765" I.D (AFR #8507)
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)