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The B429 head has a revised port profile with less cross section--its a monster sized port! SVO received a lot of feedback from racers wanting better response so they revised the port and cross section to improve lo rpm flo and hence the C429 head. This is also why they run the bigger head on the larger displacement motor...
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"I think we have more machinery of government than is necessary, too many parasites living on the labor of the industrious." Thomas Jefferson
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