chunkybs
Club Member
My old GTP went 12.3 with similar mods minus the cam ( I had a stock cam w/1.9 rockers), and a port and polished stock M90 vs the Gen V. This was on drags. Biggest warning I can give you is the transmission, I had many issues and mine was built.
you have the zzp trans? i'm on my 3rd trans, 2 being smei-built up. getting my input shaft and chain done at tax time.