Not Ranked
The short question is could you tell the difference? If you climbed into 4 cars, 1 after the other all set up to the same optimized settings for that car at a local track. !st car had an all cast iron engine, 2nd had same goodies but was a lighter full aluminum engine, 3rd was a cast iron BB and Th the lighter full aluminum BB engine. In this case the all alum. versions were 100 pounds lighter than is cast iron brother.
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