Long, Long time ago in a state far, far away I was informed that one could put a regular BB just inside where the vacume line connects. This would be for testing purposes only. Several years later I am still waiting for the results of this test.

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Ski
"Love them diesels"

63 190D (sold)
84 300SD
97 Dodge Cummins
97 HD FLSTC(if Harley made a diesel I'd have one)