Are you saying an ultra or ultras spx case is 50 lbs lighter than an 800 xcr?madcow said:you cant bore it,
a good port job, spend the money on the pipes, they will make more performance than other hp bolt ons.
xcr 1250 and the other guys know how to get good drag setups, i know speed.
what kind of lake racing? out on the snow or on ice. personally the money spent on a whal skid would leave you stuck to shaved ice only,
the best thing to do is put an 800 xcr top end on an ultra bottom end. get some 9200 rpm pipes for lake racing, advance the timing to compliment the heads and fuel requirements. the ultra is an easy 50+ lbs lighter than the 800 xcr.
for drags traction means alot, for speed runs you can spin a little. with my bone stock 800 xcr other than clutching and jettig i was getting 108.4 mph in the 1000', there were many htg 180 kit xcrs that didnt tune for speed they tuned for hp and they had a hard time with all there money spent getting 107 mph.
no matter what kind of race you are doing testing is where you will win, the guys out testing are the guys winning.