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Hey man, I strongly recommend getting new matched heads man like for a '71 ls5 because, those heads are rated differently as far as horsepower is conserned. In 72, the horses were around 300, in 75, try about 225 or 250 tops. So man i'd get me a set of aluminum heads with big valves since you're boring it, it will work fine. You do that you'll be crankin about 4 + man.
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