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Thanks for posting the graph.
I've heard that the factory aluminum heads are thin, that is that their deck is thin, as they supposidly were made with iron head molds. From my understanding, the newer heads have thicker walls and decks, and maybe better for porting and more extensive modifications, possibly with better performance potential than the original aluminum heads, both the med riser as well as the tunnel ports. Maybe you could elaborate.
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"After jumping into an early lead, Miles pitted for no reason. He let the entire field go by before re-entering the race. The crowd was jumping up and down as he stunned the Chevrolet drivers by easily passing the entire field to finish second behind MacDonald's other team Cobra. The Corvette people were completely demoralized."
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