MikeG
VIP MEMBER
what is the size of the sump plug used on my 71 Commando engine? Its the larger plug with the screen, replaced with one of Comstocks sump breathers, but I can't seem to find a tap or thread chaser the proper size. It measures 1 3/16 OD on the plug thread and is 20 TPI. I've seen it listed as 7/8 (whitworth?) but nothing I find is that TPI count.