Originally Posted by Davezilla
Doesn't the GT5 have larger intake and exhaust ports? I thought I read somewhere that their ports were wider than the PK80/F80...
Yes the gt5a has 40mm intake spaced bolt pattern
the gt5 is almost the same size though it has the standard bolt spacing but the actuall port is about 1mm wider on each side from what i have personally measured so far
that doesnt mean the gt5a is more powerfull or any better per say cause in orde for you to benifit from the wider port you still need to do a lot of dremal work via port clean up and port matching and since that stuff has to be done anyway . . . Why not just port a standard jug to the target size? so for me its nothing more than a little bit of saved time porting and if your not going to port you wont even notice a differance between the 30 and 40mm intakes