Well, the V9 is still a "small block" so no way economically feasible way to stuff a big block in (but keep an eye out for my V7-tank'ed 1380cc monster). As long as nothing major internally on the heads and cylinders has changed, I can likely match the entire top end of my 4V Racer to the new V8.5/9 motor, however, it looks as of now we might be able to cast our own 4V heads to match the 2V V9 heads.I would actually prefer a V9 with the full GT-Rx treatment but with a 1400 motor or 1200 8V; the 4v conversion even would be fun with the new v9 motor. I like the look of the heads on your 4v racer...has that old school aesthetic. Will you be doing something like that?