i bought one of the big summit rad's for my 71 GP, and it works pretty good as far as i can tell. at idle, i could sit all day long and it never creeped over 190. i also have a huge electric fan pulling through it too, so that helps. the only problem i had was when i got the rad. it was about an inch taller than the factory rad., and i had to make some brackets. pretty easy though, i just went to home depot and bought some 3/4"x4' aluminum straps and bent them to where i needed them. doesn't look half bad either.
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