posted June 02, 2004 10:40 PM
New to racing this year. My back-up motor was in the car last year and strong but previous owner told us it needed a valve job as he had lost a few hundred RPM's. Machinist touched them up but thought they looked pretty good. We noticed 4 of the 8 cylinders were scored on the exhaust side. It has good quality Wiseco alum. pistons that look good so far. The previous builder, the machinest were using and my mechanics would like to hone it and if can keep within tolerance re-install pistons with new rings. The previous owner/crew said slap it back together and run it, if we do what were thinking we'll ruin it. Need some advice. Thanks
Raz_900 Dirt Forum Champ
Total posts: 635
posted June 03, 2004 07:29 AM
If it's a backup motor, honing the cylinders a bit (say up to .006" or .007" piston - wall clearance) should still be fine. That should knock down any high marks from the scoring. Are the marks in the block just in the middle (piston rocking) or all the way up and down (dirt or bad ring)?
Either way, if you can keep clearance under .007" or so and put new rings in it. Reusing the old rings in scored cylinders will be a waste of gaskets.