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tow bar
by G Walker - 24/08/26 06:52 PM
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Jun 14th, 2026
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OP
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Anyone know the bolt type. I had to replace one a long time ago and my memory is not helping. The S&S manual shows one bolt that bolts into the head. The Morgan manual is no help. If I recall it was a two part bolt that had different threads on both ends. The looser thread went into the head and the finer thread stuck out and the exhaust manifold with the gasket and the nut retainer are held in place by a locking bolt.
What's the dimensions of the manifold bolt and locking nut?
It picked a great time to sheer off. Saturday afternoon and the local auto parts places are closed and will be closed until Tuesday as Monday is a legal holiday...
What's your mileage? Who cares. Is it practical? See #1. What happens when it rains? You get wet.
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It's a common 5/16" stud, coarse thread on the head side, fine thread for the nut. I replaced mine with ARP stainless studs (1.625" over all length) and 5/16"F all metal self locking jet nuts which really helps with socket access as they have a reduced hex head. No need for the nut retainer plate when using the jet nuts, which come from the aircraft industry, btw. In the U.S. jet nuts are available from Aircraft Spruce and racing suppliers like Pegasus Racing among others. Photo shows my ARP install before I changed pipe ends. 
Last edited by Bitsobrits; 25/05/19 05:57 PM.
Steve
Late 2012 M3W
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Thanks!
This poor brain is grateful!
What's your mileage? Who cares. Is it practical? See #1. What happens when it rains? You get wet.
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Talk Morgan Expert
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Good info Bitsobrits. The standars nuts are very close to the manifold and don't have good access.
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Thanks for the info Bitsobrits, very helpful👍
2019 M3W Sold and is now in Las Vegas enjoying the showgirls :-)
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ARP studs Jet nuts ...and some Loctite 722!
What's your mileage? Who cares. Is it practical? See #1. What happens when it rains? You get wet.
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Hi Micheal, is that no.4 or no.5 on the jet nut page?
John.
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What's your mileage? Who cares. Is it practical? See #1. What happens when it rains? You get wet.
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Joined: Mar 2015
Posts: 902
Talk Morgan Regular
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Hello
I just ordered the studs & bolts. What’s the correct header gasket #? I need to order them from the states if possible
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