Thread: Cooling Question

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Just for comparison, I have a 350 roller cam engine with the GM HOT cam, MEFI injection, 9.5 to 1 running 106 unleaded in a 4500 lb 4wd. Griffin aluminum radiator, tight fan shroud, stock GM Vortec truck serpentine fan (belt driven) and no tranny cooler in radiator. In 110F outside temp, engine never goes over 200F when pulling long hills and it can idle for over an hour with zero temp increase. Running Zerex coolant additive (like the NASCAR guys use) and no antifreeze. I'd probably have to tape over the grille to get the thing hot.....my take on the success is the fan shroud with no leaks and tight clearance around the blade tips. The fan blade fits inside the shroud by about 1/2". Remember, if it sucks, you've done it right.

mike in tucson