Originally Posted by Dynotech Racing

Uriah,

I have a OS .28xz that is about 1 gallon old, I run dirt oval with it. I was having some issues with the engine on the top end sounding like it was rich, but I know it wasn't. I took it a part to take a look at it to see what might have been a problem. Well I found that the bottom of the exhaust port had a .012 deep by .220 chunk missing out of the edge closest to the piston. It had broken off (no scratches on the piston on the exhaust side).

The problem I have is when the piston is at TDC, I can put a flashlight into the back plate hole and see the light where the chunk is gone. Is this sleeve junk, is there any way to save it? If I raise the sleeve the .012 and lower the head clearance down the .012 how bad is the port timming going to be, or should I just buy another sleeve and start over again? Any help would be greatly appreciated.

Chad