AFR 24° BBC Cylinder Head 265cc Oval Port - Race Ready

The AFR 265cc BBC Oval Port Cylinder Head offers high-velocity airflow, making it a cost-effective upgrade over reworked factory big block Chevy heads. Featuring partially CNC-machined intake runners, exhaust ports, and combustion chambers with a precision bowl blend, this torque-focused head delivers an impressive 354 CFM at 0.650" lift. Designed for street, street/strip, and towing applications, it supports engine displacements up to 468 cubic inches operating at or below 6200 RPM.

Key Features

265cc Intake Port Volume
132cc Exhaust Port Volume
Combustion Chamber Options: 109cc (Partial CNC) / 112cc (Full CNC)
24°/4° Intake & 15°/4° Exhaust Valve Angles
.750" Deck Thickness for Added Strength
Stock Intake Port Location & .375" Raised Exhaust Port
Premium PAC Racing Dual Valve Springs (Solid Roller & Hydraulic Roller Options)

Flow Bench Performance

Lift (in.)	Intake CFM	Exhaust CFM
0.200	164	135
0.300	236	190
0.400	291	230
0.500	326	258
0.600	335	274
0.650	340	280

Included Components

75% CNC Ported Exhaust Ports (Bowl Blend), 75% CNC Chambers
80% CNC Ported Intake Ports (Bowl Blend)
Competition 5-Angle Valve Job
Premium AFR Intake & Exhaust Valves (11/32" x 5.460" Intake, 1.880" Exhaust)
High-Performance PAC Racing Dual Valve Springs
10° Steel Retainers & Lashcap-Recessed Valve Keepers
ARP 7/16" Rocker Studs (Intake & Exhaust)
Adjustable 3/8" Guide Plates
Viton Valve Seals & Hardened Valve Spring Seats

Technical Specifications

Material: A356 Aluminum
Intake Port Dimensions: 2.030"H x 1.830"W x 1/2" Radius
Exhaust Port Dimensions: 1.770"H x 2.010"W
Minimum Bore Diameter: 4.125"
Spark Plug Dimensions: 14mm x .750" w/Gasket Seat
Flat Mill: Max 102cc (As Cast or CNC Chamber)
Angle Mill: Max 97cc (As Cast or CNC Chamber)
CARB Status: For Racing Use Only - Not Legal for Public Roadways

Performance & Compatibility

Engineered for high-performance applications, these cylinder heads are ideal for street, street/strip, and towing vehicles with big block Chevy engines up to 468 cubic inches. Capable of handling up to 7400 RPM with the solid roller spring upgrade, they deliver exceptional torque and power gains.