AFR’s emission legal (CARB #D-250-4) 230cc LSX heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings, Titanium retainers and high quality components throughout. Recommended for aggressive street or street/strip builds with displacements up to 427 cubic inches, operating up to 7200 RPM. Requires minimum 3.900” bore size for intake valve clearance.
230cc Small Bore LSX Aluminum Cylinder Head Flow Chart
AFR 1660 test on 3.900 bore
230cc Large Bore LSX Aluminum Cylinder Head Flow Chart