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Originally Posted by Hank
I've gat a set of heads I'm going full bore with. Port and Pollish, shaved valve guides, and chevy valve springs. The chevy springs will be much stiffer and more suitable with the 260 cam at higher RPM's. In orer to fit the springs, the spring seats need to be milled aswell.
With keeping the GEM's fuel injection, I'm looking at to run about 250hp in the 4.0
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Yea, I got the stiffer springs from D&D when I was doing mine. I don't remember having to mill the spring seats though (but then I don't know that they were Chevy). The stiffer springs were meant to prevent valve float up to 6500 RPMs which I could never do anyway.
Man that's Killer that porting made that much difference for you!!!
Not trying to be funny or anything, but how were these performance gains measured? Did you do a before and after dyno on it?
What does shaving the valve guides do?
Peace,
Dan
