AFR 23° SBC Cylinder Head 245cc Competition Package Heads, Standard Exhaust, 80cc Chambers

Our largest and most powerful 60/40 head for the small block Chevy features 100% CNC machined intake runners, exhaust ports, and combustion chambers. Capable of flowing 350 CFM at 0.800" of lift, these heads come equipped with Titanium retainers and high-quality components throughout. The 60/40 valve spacing requires shaft-mounted rocker arms for optimum valve train geometry and extra machining for 3/8" pushrod clearance. NPP stands for "no pushrod pinch."

Included Components

100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5-angle Valve Job
8mm Bead Lock Intake Valve, 2.125" x 5.000" Overall Valve Length – AFR #7253
8mm Bead Lock Exhaust Valve, 1.600" x 5.030" Overall Valve Length – AFR #7254
PAC #1225 Racing Springs 1.550” OD Solid Roller Dual Valve Drag Race Spring, 250 lbs. on seat, .800” max lift, Max RPM 8000-8200 – AFR #8001
10° Titanium Retainers 1.500” O.D x 1.120” I.D x .705” I.D – AFR #8505
10° Bead Lock Valve Keepers with lashcap recess – AFR #9009
Viton Valve Seals .600" O.D x .495" I.D – AFR #6612
Hardened Valve Spring I.D Locator 1.550” O.D x .780” I.D – AFR #8048
Ductile Iron Intake Valve Seats 2.200" O.D x 1.750" I.D x .375" Deep – AFR #9060
Ductile Iron Exhaust Valve Seats 1.696" O.D x 1.325" I.D x .305" Deep – AFR #9070
8mm Bronze Valve Guides .502" O.D x 2.100" O.A.L – AFR #9051