Please someone tell me there is a tool for Exhaust Manifold bolts.... - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-04-2012, 01:27 AM
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Please someone tell me there is a tool for Exhaust Manifold bolts....

Removed my engine today..
350, off to the machine shop. As I was taking off my manifold bolts, I noticed that a couple of bolts that were up against pipe weren't tightened all the way, which was really good for me, because there was no way that a wrench would fit on it. They are 12 point bolts.
Is there a solution to this annoying problem? A special tool? Special bolt?
I did some research and the only two resolutions found were
1. Allen Emanifold bolts
2. bolt with smaller head then thread diameter
Does anyone have any advice on replacement bolts?

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Old 06-04-2012, 05:10 AM
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Reduced hex diameter bolts work OK on most headers- which I hope you'll be using and not the stock manifolds. Sometimes you'll need special tools to get to them easier; below are my "header tools" (like heavy duty ignition wrenches) that fit most 7/16" reduced hex header bolts just fine.
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Old 06-04-2012, 06:59 AM
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thin wall sockets

good quality thin wall 12 point sockets and a wobble end extension, sometimes I have ground the end of the socket flat to remove the internal chamfer to get a better bite on the head.
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Old 06-04-2012, 07:08 AM
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Quote:
Originally Posted by cobalt327
Reduced hex diameter bolts work OK on most headers- which I hope you'll be using and not the stock manifolds. Sometimes you'll need special tools to get to them easier; below are my "header tools" (like heavy duty ignition wrenches) that fit most 7/16" reduced hex header bolts just fine.
Obviously my open ended tools are for a 6-point hex.



There are several different types of retention used for header bolts. Some options from a search for "locking header bolt":

Specter pre-drilled safety wire
Stage 8 bolts (nor grade 8)
Percy's split lock bolts, etc.
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Old 06-04-2012, 07:09 AM
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Sockets and crowfeet are available for 12 point bolts....
http://www.google.com/#hl=en&sclient...w=1192&bih=488
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Old 06-05-2012, 09:42 AM
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I can attest to Stage-8 locking bolts doing their job. No more leaks, but that clip can be a royal PITA if you're in a hurry. Plan ahead.
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Old 06-05-2012, 10:45 AM
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I know the exact bolts you are talking about and these here are the trick. I don't like cheapie tools but let's face it, it isn't like you are going to put a super lot of torque on them being as short as they are. So I went down to HF to get a set of these when I removed the headers from my Buick, it has those exact bolts on it.



And if that don't work, this baby (I have two longer ones for hinge adjustment)



Brian
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Old 06-05-2012, 11:27 AM
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A selection of header bolts, etc. can be seen here.
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Old 06-05-2012, 02:04 PM
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I use a small box wrench, ground to within an inch of itīs life to fit.
I have large tube Hedman Hedders with the small headed hex bolts.
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Old 06-06-2012, 12:01 PM
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I just go with allen head cap screws and be done with the issue..That is once you get the old ones out..

Sam
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Old 06-06-2012, 05:05 PM
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Thanks for all the info...
One of the main problems I was having was that even the small 12 pt head was hitting up against the pipe (and they are headers). So I can't get a closed end wrench over the head. Seems as the only solution to that is an allen bolt.
I was worried bout allen because they can be more vulnerable to stripping. But I guess you can't have your cake and eat it too....
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Old 06-06-2012, 05:30 PM
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Quote:
Originally Posted by jsm1847
Thanks for all the info...
One of the main problems I was having was that even the small 12 pt head was hitting up against the pipe (and they are headers). So I can't get a closed end wrench over the head. Seems as the only solution to that is an allen bolt.
I was worried bout allen because they can be more vulnerable to stripping. But I guess you can't have your cake and eat it too....
Get a good quality grade 5 allen head. Use the correct lock washer with them which are called "high collar". The high collar lock washers are the same diameter as the allen head so they won't interfere with the pipe either.
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