AFR 15° LS1 210cc Enforcer As Cast 64cc Chambers, 4.8/5.3 Small Bore, 2.000"Int/1.570"Exh Valve

AFR's 210 LS1 Enforcer Cylinder Heads feature Permanent Mold “As-Cast” Technology on the intake runners, exhaust runners, and combustion chambers. This ensures accurate and repeatable port location and performance. Designed as a budget-friendly option, these heads are ideal for OEM engines operating below 6300 RPM.

These cylinder heads come fully assembled with high-quality components found in AFR’s premium CNC-ported versions, including PAC Racing springs, Viton valve seals, machined bead valve locks, hardened spring seats, and one-piece 8mm 21 4N Stainless Steel valves. They are also available as bare castings for DIY builders.

Sold individually—two required per engine.

Included Components

As-Cast Combustion Chambers
As-Cast Exhaust Ports
As-Cast Intake Ports
3-Angle Valve Job
8mm Bead Lock Intake Valve: 2.000” x 4.900” O.A.L. (AFR #7236)
8mm Bead Lock Exhaust Valve: 1.570” x 4.915” O.A.L. (AFR #7235)
PAC Racing Spring: 1.290" OD Hydraulic Roller Dual Valve Spring, 140 lbs on seat, .600" max lift, Max RPM 6300-6500 (AFR #8017)
7° Chrome Moly Retainers: 1.245” O.D x .885” I.D x .655” I.D (AFR #8514)
7° Bead Lock Valve Keepers: (AFR #9007)
Viton Valve Seals: .620" O.D x .490" I.D (AFR #6615)
Hardened Valve Spring O.D Locator: 1.380" O.D x .570" I.D (AFR #8042)

Flow Chart (28" Water Pressure, Superflow 1020)

Lift (in.)	.200	.300	.400	.500	.550	.600
Intake (CFM)	136	199	246	272	276	265
Exhaust (CFM)	93	140	180	204	211	215

Specifications & Features

Material: A356 Aluminum
Intake Port Volume: 210cc
Exhaust Port Volume: 82cc
Combustion Chamber Size: 64cc
Valve Angle: 15°
Deck Thickness: 0.425"
Minimum Bore Diameter: 3.780"
Flat Mill: .006" per cc (58cc max)
Spark Plug Dimensions: 14mm x .750" w/Tapered seat

Legal Disclaimer

CARB Status: THESE PRODUCTS ARE ILLEGAL TO OPERATE ON ANY PUBLIC HIGHWAY, INCLUDING PUBLIC PAVED OR UNPAVED ROADS, OR IN PUBLIC PARKS. LEGAL USE IS RESTRICTED TO DEDICATED RACING VEHICLES ONLY. VIOLATIONS MAY RESULT IN A MAXIMUM PENALTY OF $37,500 PER VIOLATION PER VEHICLE, REVOCATION OF DMV REGISTRATION, LOSS OF USE ON PUBLIC ROADS, AND REQUIRED PROOF OF CORRECTION.