Speedmaster spark plug holes improvement??

12many said

There’s always better everything. Where does it end? Me? Hit em with a sanding roll and on to the next thing.

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Couldn't agree more... and I like agreeing with a guru :) If I'm going to pay a machinist to machine on the plug area, port them, 5 angle valve job..... I'll just take my money and buy ProMaxx Shockers or TF. The catch 22 is the price... I gave 703 fully loaded to my door (I said for J par... LOL).