Twin Cam Hop-Up
7. Then John milled the valve seat pocket for a .007-inch interference fit. The new, larger valve seats are kept in a freezer in order to shrink to their minimal size. When the heads are ready to be seated, they are placed in the oven so that they can expand to their maximum size, which results in the seat perfectly mating to the valve seat pocket. John's never had a seat fall out.
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