Afternoon Gents
Just writing too ask if you can advise on a thread size on a 1991 350 Chevy block.
In the
oil filter area their is a 1/4" NPT thread for the
oil pressure switch & gauge & just too the right their
is a coarse thread which I need too plug, can you advise what size is it.
Plus their is another similar thread on the same side, middle top edge of block & it plugs the water jacket, what size is this, probably the same.
Any help would be great
Best Regards
John