The 227CC AFR Race Ready cylinder heads feature 100% CNC ported intakes while the higher flowing Competition version features 100% CNC ported intakes with greater detail. combustion chambers are 100% CNC ported and the 80cc exhaust ports have a 3/4” thick head deck (ideal for nitrous or blower applications).

Standard valves are lightweight 8mm 2.100 intake and 1.600 exhaust with AFR’s hardened ductile iron interlocking valve seats. The 227 has 60/40 valve spacing and piston valve pockets should be checked. The exceptional flow characteristics and 23º valve angle make this the perfect cylinder head for 350 to 434 cid engines in drag cars, sprint cars, and late model oval trackers operating from 4500 rpm and up. The 227cc cylinder heads are available in either standard or spread port exhaust. AFR offset stud girdles are the only special parts required (see footnotes here).

Some applications require shaft mount rockers or .050 offset rocker arms for durability and reliability of valve train components. Standard rockers can be used but the intake rocker arm will be at a slight angle and the roller tip will not be perfectly centered on the valve tip. Not recommended for street use, unless shaft mount rocker is used. The exhaust port is raised .250 over GM L-98 cylinder head.

Note:
These cylinder heads are specifically design for 1992-95 Corvettes and 1993-97 Camaros LT-1 and LT-4 engines using the GM LT-4 or equivalent manifold.