HA! THANKS FRED, I GOT IT BACKWARDS, I HAVE USED CLAY TO CHECK PISTON/HEAD CLEARANCE ON CARS. Have you ever used mopedwarehouse on machine work? I have and got nice work back, porting, polishing,heli-cores, ect. A hell of a lot better priced than here in VA.and there are a lot of shops here. Chris, will cut you some slack. Thanks Fred for the correction. Doug D.