Exhaust Manifold Studs

[MattsLincoln]

i need 4 Exhaust manifold studs and nuts for a 1983 Mercury Grand Marquis with the 5.0 V8. I don't want to buy new manifolds just for the studs. they don't sell them in any auto stores around here. I need them desperately.

[85crownHPP]

Lowes!

[MattsLincoln]

will they have the correct size. also what would that size be.

[91grandmarquis]

I would go to one of the stores and make them look up the part # for you, I couldnt find just the studs on rock auto.... parts stores must be able to get them.

[MattsLincoln]

I would go to one of the stores and make them look up the part # for you, I couldnt find just the studs on rock auto.... parts stores must be able to get them.

tried they couldn't find any part numbers for them. Not even showing up in there database.

[91grandmarquis]

Lowes can help you then or Mcmaster-Carr They have everything ever.

http://www.mcmaster.com/

[P72Ford]

Take one of the old ones to the hardware store. You can use a regular hex head bolt, and washer in place of the studs.

It'll be a domestic, coarse thread. Probably 3/8-16, but don't quote me on it. Make sure you get the right length. Don't ask me what the correct length is. If you have the old studs/ bolts, you should be able to figure it out.

If you're not replacing them all, then just get grade 5 (3 tick marks on the head).

[MattsLincoln]

my old one is so stripped they cant even tell the size or anything. Whats the thread length and all. i dont have the old one to match up anymore. Lost it somewhere plus wouldn't have helped.

[gadget73]

Take another one out. There are 4 of the things. Failing that, the size and thread pitch can be determined by the nut.

[MattsLincoln]

but all of them come out stripped and you can barely tell what it is

[1987cp]

I should have one or two complete sets of used studs sitting around, and can probably obtain a third set. IIRC they're 3/8-16 thread. If in doubt, fish a 3/8-16 bolt out of your Magic Bolt Box and verify that it threads into the head. Or I could fish a bolt out of a header and verify that it's 3/8-16. Or I could just send you some of the stuff I have sitting around creating clutter. Either way.

Any particular reason you're sweating over something like this? And who said you have to buy brand-new factory exhaust logs (a patently lousy investment, since used HO manifolds are usually under $50 obtain and ludicrously easy to install) in order to get new bolts/studs?

BTW, there's no reason they need to be studs unless you're intent on retaining things that bolt to the other end. And NC Grade 8 bolts can be had at any hardware store.

And if it hasn't been said already, if you for some reason decide to try Allthread, make sure it's Grade 5 or better, preferably Grade 8, since most Allthread is incredibly soft. You'll probably have to go to Fastenal or McMaster for hardened allthread, though.

[Lincolnmania]

they are 7/16" thread, not sure on the thread pitch
i would harvest a pair of lincoln logs (30 bucks at harrys) instead of using ho headers

[1987cp]

they are 7/16" thread, not sure on the thread pitch

Ah, that does sound right now that you mention it. 7/16-14 or somesuch - though NC (national coarse for the bolt n00bs) is always the default when browsing through your local hardware store's main Grade 8 section.

i would harvest a pair of lincoln logs (30 bucks at harrys) instead of using ho headers

I tend to forget about this option, possibly because I've still not actually seen Lincoln Logs in person (the exhaust manifolds, not the cabinbuilding toys). Direct-bolt-on tubular manifolds make reinstallation of cast logs seem even more utterly pointless and otherwise needlessly troublesome.

[MattsLincoln]

im talking bout the studs the come out from the bottom of the manifold to bolt the cats on. Need the exact size.

[88grandmarq]

sent you a PM