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Originally Posted by Archrms
Rick & Steve,
If I understand you both correctly, there is no difference between a regular and a NASCAR block, except that the NASCAR blocks had heavy duty parts inside. So there should be no way of telling them apart from the outside. They would have to be torn down to see what is inside of them. Is this correct?
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Yes, and you don't want those internals. They were designed to run at a constant high rpm for 500 miles.