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TrickyT · 06-30-08, 11:23 PM

Valdez,
I'm pretty much exactly in the same spot as you. I'm ready to re-assemble my 1989 3FE and before I drop my rebuilt head on I want to clean out the threads in the block. But I just discovered today that those head bolts are a very unusual size. I measure the bolt threads as ~12.7mm diameter with a pitch of 1.75mm. I can't find a tap anywhere near that, especially the 1.75 pitch part. I need to do some more searches in the 60-series forum, but at this point I'm thinking I'll just grind a groove lengthwise in an old head bolt and use that to chase the threads.

Edit: Link to needed tap (13mm x 1.75mm): MSC Item Detail

06-30-08, 11:23 PM	#3
TrickyT Hate that mud... Join Date: Apr 2006 Location: Mill Valley, CA TLCA# 14435 Posts: 210	Valdez, I'm pretty much exactly in the same spot as you. I'm ready to re-assemble my 1989 3FE and before I drop my rebuilt head on I want to clean out the threads in the block. But I just discovered today that those head bolts are a very unusual size. I measure the bolt threads as ~12.7mm diameter with a pitch of 1.75mm. I can't find a tap anywhere near that, especially the 1.75 pitch part. I need to do some more searches in the 60-series forum, but at this point I'm thinking I'll just grind a groove lengthwise in an old head bolt and use that to chase the threads. Edit: Link to needed tap (13mm x 1.75mm): MSC Item Detail __________________ Tom Ferrin N6TEF - 2m and 70cm 1989 FJ-62 - 200K, 3" OME lift, recent engine overhaul, my daily driver 1997 FZJ-80 - 85K, lifted, bumpers, sliders, lockers, and Moab-trails tested Last edited by TrickyT; 06-30-08 at 11:27 PM. Reason: Found correct tap size