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They were trying to make up for the initial horse power loses due to the change from closed cumbustion chambers to open cumbustion chambers by adding hidden Cubic Inches with the least amount of design change as possible. Radical design changes cost big bucks. It was later determined that the open combustion chamber could produce more horse power, but they did not have time to do the initial research due to the emmision changes. The big question is why did they get rid of the "W" heads that the 348 and 409 used?
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