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Ultimate Diesel Builder's Guide - - Horse Power -

Plenty of se­cret sauce here too. The goal is to en­large the ports, make them all equal in size and shape (ex­cept the two end ports and you just do the best you can), elim­i­nate the choke points and any "iron boogers" (that's the tech­ni­cal porter's term) pro­trud­ing into the run­ner.

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