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Re: RnD Fabrication 1967-1972 Chevrolet & GMC early C10 / C20 / Blazer Radiators!
That does make a difference. That means you are probably in the 600-620hp range. I would go with the upgraded unit at a minimum, and would consider the extreme duty (that's what I run on one of my LS applications that will eventually be boosted).
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