Old school Day 2 Mr Gasket timing cover bolts
 

They don't make this style bolt anymore all they sell is the recessed flanged head. These are cool, this is what you have bought back in the sixties to put on your motor. 11 enough to do small-block and big-block. 55 ships to the lower 48 https://www.yenko.net/ubbthreads/pics...5_16.31.00.jpg
https://www.yenko.net/ubbthreads/pics...5_16.30.48.jpg