Re: Small Block 400 (511)
You will need a good radiator. Look at what is put in a vehicle of the era that the 400 SBC for the amount of area you need. A '67-72 radiator will give you the idea. Your truck has a down flow radiator, so I'd recommend at least a 3-row if you don't have AC. Chevrolet cheaped out in '71 and put 2-row radiators in big wagons with AC and ate a bunch of engines under warranty from overheating. It wasn't the engine, it was the piddly radiators.
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~Steven
'70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper
Simi Valley, CA
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