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Jim, im the guy who posed the car craft article about the 5.3 .Check out Hot rod magazine site , they have a series on the big mootor & had been dyno testing different heads , intakes & such, then went to power adders, later in the series. I think it might help you in your research.
Funny i had ignored both theos mags for decaes until I got a chepo subscription, I cant believe th wealth of info in those pubs lately & on there web site. Seem they went back to their roots.
Peter m
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