Quote:
Originally Posted by SofaKing
It is certainly preferable that all air sources are filtered however I don't see how that is practical with the 21 stud rear main design.
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Assuming that you do have a rear seal installed.
The pump stand filler cap/filter is where the air is (should be) drawn into the engine.
Although my system is on an 8BA the principals are the same.
This is a water column check for crankcase vacuum.
