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GMFS Senior Member
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3,237 Posts
Discussion Starter · #1 ·
What all is involved in swapping a stock radiator in an OBS truck from the original 28" that came with the 5.7, to the 34" that was in the 7.4? Truck is an 89 if that matters. I can't get this thing under 220 on the interstate with the ambient temperature above 90 degrees. I want to be right around 200. If I turn the A/C on it makes a b-line for 250. Only mods are Lunati cam, higher flowing Caprice injectors(whatever lb/hr they're rated at), upped fuel pressure and running E85, with a one off tune from a local guy who is pretty damn good IMHO. I'd rather not have to have him go back and pull timing/increase fuel since I'm still getting DECENT mileage IE-I'm filling up twice a week no matter what fuel I use. From looking at it all I may need is the upper part of the fan shroud, anything else? All the mounting holes appear to be there.

Truck for ref. (shitty pic i know. most current i have)

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HOT AIR BALLOON OWNER
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14,932 Posts
PM "Smith" he's done it. It was just a straight swap with brackets.
 
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