Quote:

Flex plate bolts have a 3/4" head. The factory bolts had 5/16 thread and after market has 3/8 both with fine thread



The bolts that hold flexplate to the crank have 3/4 heads , the flexplate to convertor are 9/16 in the case of an engine with it's original convertor.

the original question

Quote:

what size is the head of factory converter to flex plate bolts (4) thanks