I had a friend do two engines 8 years ago, one a very old thunder tiger from the early eighties and a TT GP42. I tached both prior and gained consideribly. The sleeve was ported as well as the timing advanced and the crank intake port polished. This was done with a dremel tool and no timing wheel. I was very happy with the performance after.

There are threads about porting the car and buggy engines, in the car forum like [link]http://www.rcuniverse.com/forum/m_3107667/anchors_3389821/mpage_1/key_/anchor/tm.htm#3389821[/link]

If you do take one to the extreme let us know how you made out

Richard