Quote (ride686 @ Aug 9 2013 11:56pm)
Fuel economy.
Its canadian.
Anything under a mid 230's duration int/exh when coupled with long tubes and a good tube will barely effect fuel economy if you can keep your foot out of it. The headers and tube offset the losses from the cam. That would be about 410-420whp in your application. Full exhaust and a tune can knock down 30mpg on the hwy in a Z. With a small/medium cam I would say 26-28 with LTs and a good tune.
I got 24mpg@80mph in my formula with a bigger cam.
Even a mid 220's duration would get you near 400whp and even less of an efficiency drop. On a high enough lsa it would have zero overlap. The old standby 224/224 on a 112lsa has 0°. ((224+224)/4)-112(2). That cam will actually drive like stock but pull harder top to bottom. That is .050" duration, not total overlap btw.