PART NO. SPL.PAGE DESCRIPTION
AEH393 TC.A.16 Pipe -water outlet -(head to thermostat, water.pipes, Twin Cam)
AEJ4 TC.A.16 Washer -pipe to cylinder head (copper) -(to thermostat, water pipes)
The thread is 11TPI BSPP (British Standard Pipe Parallel) which uses the 55-degree Whitworth Form.
It may be called G16 Straight Pipe Thread (where "16" is 1/16th inches for a 1-inch pipe).
More commonly 1-11-BSPP male thread. Major diameter 1.309-in and 55=degree thread angle.
Use with AEJ4 Washer -pipe to cylinder head (copper)
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