How hot has the motor got? What did you do for a cooling system with your mod? Did you install a new radiator? If so, how big is it? Is it a 4 core unit? Are you running a fan driven from the water pump or did you go with an electric fan? Are the fenderwell shrouds on the truck or did you remove them to make sure that enough air could escape from the engine compartment? What degree thermostat are you using? There's a lot of factors that can cause the overheating problem. If you give us a rundown of cooling system, we can get a better idea of what could be the reason. If it turns out that your cooling system is up to par, we can focus on the motor itself.
_________________ Previous setup: 4.1 Buick V-6/TH 350
Current setup: 400 Small Block Chevy V-8/TH 350
9" ford rear end/short bed/blue
What do Water, Electricity and Humans have in common... They all travel the path of least resistance.
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