Tubs;
Its 1/4-20 NC but 0.010″ oversize. Probably a # 14 screw like Joe says. Whatever it is, I recently finished making a set of these bolts for an early Johnson, they hold the cylinders onto the crankcase housing. I didn’t use a die for the threads, I just cut them in the lathe.
Hope it helps.
Best,
PM T2
He's livin' in his own private Idaho..... I hope to go out quietly in my sleep, like my grand-dad did..... and not screaming, like the passengers in his car...
