Quote:
Originally Posted by Geronimo555
I would be surprised if you got 125HP from just those mods... 450CHP maybe. I would think a 475-500chp LT4 would put a hurting on a sub 500HP LT5, on everything under 120mph.
I love the LT5, but the cost of making an LT4 fast is just so cheap compared to the LT5.
A full exhaust and 4:10 would be the most I would do to a Z personally.
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My motor put down 400rwhp with ported top end and headers. And the real difference is that power peak is at 6800rpm w a torque peak of 5300. Your LT4 is panting after 5000rpm. If you do your own porting, its pretty inexpensive.