oh god yes it is! OK mine is a CVH and I got a steel fly wheel from Burton instead of a cast iron from ford. makes things a lot smoother, I went as far as getting it all balanced though! Pistons, con rods, rings, crank, pulley as well as the fly wheel too! Coventry balancing has a good reputation! I think they have been taken over now though. but they are still there and did me a damn good job!