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Nut & bolt sizes engine mounts??
Posted: Sat Sep 14, 13 6:22 pm
by TW71
Does any one have any information for the original nut and bolt size / length / thread type ( unc or unf ) for the engine mounts that Ma mopar used (71 b and big block) , the one's that go through the lugs on the engine block / mount ears?
It may be easier to get a fresh set , I seem to have a mixture.
Thanks!
Posted: Sat Sep 14, 13 10:40 pm
by JohnR
From the bottom of the dark pit that is my brain 7/16 UNC X5 1/2 ins long or maybe 4 1/2 long
Posted: Sun Sep 15, 13 6:07 pm
by Cannonball
secerall lengths used but they are unf for sure, maybe they went unc a bit later
Posted: Sun Sep 15, 13 7:30 pm
by Pete
Every correct motor mount Bolt I have ever seen have been UNF.
They do vary according to position on the 3 holes per side....Grade 8 though from memory..........
Posted: Mon Sep 16, 13 10:19 am
by TW71
Thank you guys, I will get some fresh ones ordered, UNF #8??
Pete you say maybe grade 8, do you think this would be the way to go with solid mounts?
Posted: Mon Sep 16, 13 6:41 pm
by JohnR
Miss read this thought they were the ones that go in the bottom !!! yes 7/16 UNF and lock nuts , I think a couple of them are longer as the lugs are thicker , sorry if I misled anyone
Posted: Tue Sep 17, 13 9:47 am
by TW71
Thats ok John, I was interested in that one as well so your input was helpful!
I am not sure whether its grade 8 on the engine side or 5?
Posted: Tue Sep 17, 13 6:22 pm
by TW71