That's a 3/8-16 bolt, not 7/16. It's one of the ones that were used to mount the bird leg motor mount brackets onto the early engines. The hole is intentionally drilled all the way through- - - -it's supposed to be used with a long bolt during a fuel pump change to keep the pushrod retracted.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!