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JSeery · 11-01-2019, 12:55 PM

That is confusion between head studs and head bolts. Both 59a & 8ba blocks are taped course threads. The studs are course threads into the block and fine threads on the end of the stud that the nuts attach to. Bolts would have to be the same thread as the block, the course threads. And all the head bolts are the same thread size.

11-01-2019, 12:55 PM	#2
JSeery Member Emeritus Join Date: Nov 2012 Location: Wichita KS Posts: 16,132	Re: coarse & fine threads on headbolts? That is confusion between head studs and head bolts. Both 59a & 8ba blocks are taped course threads. The studs are course threads into the block and fine threads on the end of the stud that the nuts attach to. Bolts would have to be the same thread as the block, the course threads. And all the head bolts are the same thread size.