Mike Salter is correct. The thread is 3/8" x 28 tpi. In the engine block.
3/8' x 24 is BSF (British) and UNF (US) fine thread for a machine
screw/bolt;
3/8" x 24 is also used in brake line fittings for the tube nut which
requires a 7/16" line wrench.
3/8" x 27 tpi is 1/8" NPT (US) - National Pipe Thread and is tapered
3/8" x 28 tpi is 1/8" BSP (British) - British Straight (or standard) Pipe
and is not tapered. You should use a copper washer with the fitting.
Many owners force in the wrong NPT nipple into the block, which results in
oil weeping from the fitting.
Best regards,
Jim Hockert
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