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400 exhaust manifold bolts... #2536899
08/15/18 09:08 PM
08/15/18 09:08 PM
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ramman16248 Offline OP
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I am tearing down my 400. the manifold bolts in the center of the exhaust manifold have an odd looking bolt, where the head of the bolt is about the same diameter as the shank of it... what tool do you use to remove them?? there isn't a traditional 6 point or 12 point head on it. The motor is original and has never been worked on to this level, so the bolts are probably original to it. Thanks, Jay

Re: 400 exhaust manifold bolts... [Re: ramman16248] #2536923
08/15/18 10:11 PM
08/15/18 10:11 PM
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Posts: 156
Canada north shore lake Ontari...
ross Offline
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Canada north shore lake Ontari...
Can you post a pic

Re: 400 exhaust manifold bolts... [Re: ross] #2536925
08/15/18 10:21 PM
08/15/18 10:21 PM
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ramman16248 Offline OP
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I will try to get one tomorrow....

Re: 400 exhaust manifold bolts... [Re: ramman16248] #2536987
08/16/18 12:59 AM
08/16/18 12:59 AM
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Philadelphia
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radar Offline
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I just took apart a 400 from 1978 I remember that some of the bolts or studs were real thick or had a special shape. I just looked through all my baggies of bolts in the garage and couldn’t find them but they unscrewed just fine despite their special shape- they were somewhat memorable but didn’t cause any difficulty.

Good luck hopefully somebody here has pics or a part #

Re: 400 exhaust manifold bolts... [Re: ramman16248] #2537003
08/16/18 01:35 AM
08/16/18 01:35 AM
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Cascade, CO
reknapp52 Offline
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A little bit off topic, but-----I am also tearing down a 400 truck engine that has been sitting in the way in my garage for about 12 years. Are there any parts worth anything besides the block? It is a 1975 engine with 452 heads. Sorry, the exhaust manifolds were removed years ago.

Re: 400 exhaust manifold bolts... [Re: ramman16248] #2537137
08/16/18 01:08 PM
08/16/18 01:08 PM
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S.E. Michigan
ZIPPY Offline
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ZIPPY  Offline
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Maybe this will help. The weird looking nuts at the bottom are usually used in a hole or three here and there depending on the exact model.

hp manifold bolts.JPG

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Re: 400 exhaust manifold bolts... [Re: reknapp52] #2537140
08/16/18 01:12 PM
08/16/18 01:12 PM
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Apollo, PA.
B1MAXX Offline
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Those will be shanked nuts not bolts. The hex originally is the same diameter of the shank. These had a typical hex 6-point hex. What happens is they rust away and become all kinds of funny shapes. I usually beat a smaller socket over them and then take them of.

Re: 400 exhaust manifold bolts... [Re: reknapp52] #2537150
08/16/18 01:34 PM
08/16/18 01:34 PM
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Philadelphia
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Yup! Those are exactly the ones I pulled off in the above pic!

Originally Posted By reknapp52
A little bit off topic, but-----I am also tearing down a 400 truck engine that has been sitting in the way in my garage for about 12 years. Are there any parts worth anything besides the block? It is a 1975 engine with 452 heads. Sorry, the exhaust manifolds were removed years ago.


Mine had the heads on it that are the same as the desireable earlier big block heads but with hardened seats. I forget the casting # but I pressure washed and wire brushed them and sold them on craigslist for $100 inside a couple weeks.

Cast crank = scrap, valvetrain=scrap (keep the rockers and pushrods), my water pump housing looks like a million bucks after a good cleaning and paint. Lots of good bolts and nuts to clean and wirebrush if you’re a cheapskate like me. My intake and valve covers haven’t sold at giveaway prices I will probably scrap them too but it never hurts to have a coffee can full of the little triangles. I cleaned up and painted the valley hold downs. Basically just the heads and any small parts ot unique hardware that are a pain in the neck and nickel and dime you to death when your budget is getting smaller at the end of a build.

Good luck

Last edited by radar; 08/16/18 01:35 PM.
Re: 400 exhaust manifold bolts... [Re: ramman16248] #2537229
08/16/18 03:43 PM
08/16/18 03:43 PM
Joined: Jan 2003
Posts: 15,683
S.E. Michigan
ZIPPY Offline
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ZIPPY  Offline
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Yeah, they rust into various forms... Then the stud seizes inside em, and it looks just like a bolt from Jupiter....


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Re: 400 exhaust manifold bolts... [Re: B1MAXX] #2537951
08/18/18 12:34 AM
08/18/18 12:34 AM
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ramman16248 Offline OP
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That's exactly what they are, did and that it exactly how I got them out!!!! LOL!!! Thanks!!!!!


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