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What's the difference between a 350 & a 400 Big Block?

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ironrat:
If it is the small block 400 you really have no problems with it if in good condition, the so called heating problems was in cars, the cooling system you would have in your RV would cause NP's. To check to see what you have you can look at the valve covers, if you have two bolts along the bottom and two on the intake side of the cover it is the small block. The big blocks had 4 bolts on the bottom and 3 on the top, also in truck use the small block was a two barrel carb and the big block used a 4 barrel carb.

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