Correct. The block doesn't make horsepower, it holds the parts that do. The 73 and later blocks were better castings and have some oil passage improvements from the 70 block.
86 GN, all factory options, engine build in progress
72 Skylark Convertible, 462, TH 400
72 GSX Clone 464, TH400, 3:42. 10.71 @126mph best
We build GM carburetors and specialize in custom built Quadrajets
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