I just purchased a brand new casted head with oversized valves and rv springs i also purchased a rebuild kit with oversized pistons. The kit came with timing kit, pistons, rings, bearings, oil pump, gasket kit, rv cam, and some others for dirt cheap from a place called engnbldr.com. The rebuild kit minus the cam was $218 with the cam it was 300. The head completely built was 400. Everything runs great 50 horse gain!!!