The Revelry Racing CNC Porting and “Big Valve” cylinder head conversion includes 8 new valves and 8 new seats all fitted and seats cut. (no seals or springs)
Increases intake flow 37.9% and exhaust flow 36.9% over stock cylinder head.
Requires a new head gasket (included with S&S big bore kit) and new cylinder head bolts (not included).
This is CNC porting and big valve conversion of your existing cylinder head & throttle body adapters.
NOTE: To have a genuine Royal Enfield cylinder head assembly and two new throttle body adapters included (keep your existing head) please order RR-CNC-650-TWIN-BV-CH.