But if it proves to be a massive improvement it'll all be worth it........! As you know, I did a bit of head work on that little 1905cc I brought up to the rollers, just a bit of combustion chamber re-profiling, minor work on ex ports and inlet ports, the inlets on those heads were actually matched for a set of Dell's I was going to strap on, not the weeny Webers I ended up sticking on, and it made good power for what it was, so I reckon you'll see good gains with all the work you guys have done......!!