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| mistaben | what do I put on the threads of the exhaust manifold bolts? | ||
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Senior Guru
 
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what are you suppose to put on the threads for the exhaust manifold bolts?
also, if the gaskets only have like 50 miles on them, can I just reuse the old ones? thanks guys! |
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Posted on: 2011/8/17 5:34
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| bogus | Re: what do I put on the threads of the exhaust manifold bolts? | ||
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Grand Imperial Pooh-Bah
 
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I don't put anything on them... anti seize will screw up the torque rating...
As for the gaskets? Reuse'm... should be fine. |
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Posted on: 2011/8/17 5:38
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| istter1 | Re: what do I put on the threads of the exhaust manifold bolts? | ||
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Elite Guru
 
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Don't use anti-seize compound.
Steve |
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Posted on: 2011/8/17 5:43
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Only I can change my life. No one can do it for me. Carol Burnett |
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| istter1 | Re: what do I put on the threads of the exhaust manifold bolts? | ||
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Elite Guru
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Oops sorry Andy. What are you still doing up?
Steve |
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Posted on: 2011/8/17 5:46
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Transfer
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| mistaben | Re: what do I put on the threads of the exhaust manifold bolts? | ||
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Senior Guru
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fsm says about 19lb-ft for stock. afr webpage says don't use a torque wrench just snug up hand tight with a wrench only. seems good to me... what I was going to do anyways, pull on it until it "felt right". *shrugs*.
thanks again guys |
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Posted on: 2011/8/17 6:53
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| Matatk | Re: what do I put on the threads of the exhaust manifold bolts? | ||
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Webmaster
 
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I disagree. I use anti seize on my header bolts. That along with stainless steel cap screws with lock washers.
The gaskets depend. I use Percy's reusable gaskets. If you have cheap style header gaskets, replace them. They aren't that expensive. Matthew |
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Posted on: 2011/8/17 7:33
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| bogus | Re: what do I put on the threads of the exhaust manifold bolts? | ||
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Grand Imperial Pooh-Bah
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I am careful when torquing into aluminum. And I have broken an OEM exhaust bolt when using anti-seize! Took the head right off.
If you decide to use anti-seize, take the torque from 19 to about 12 lb-ft. Figure that half the battle with torque is consistency and the issue here is that A-S will increase the specific torque by half - meaning 19 becomes 28. This would mean that 12 becomes 18 and everyone is really happy. |
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Posted on: 2011/8/17 16:28
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_________________
The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| Strick | Re: what do I put on the threads of the exhaust manifold bolts? | ||
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Guru
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I make sure I have enough thread to go into the head. Most headers come with 3/4" bolts. I used 1" S/S allen head bolts because my flange was thicker than most. The allen head makes it easier to torque each bolt. Also, use a quality thread chaser to clean out the holes. Gaskets, I use the "dead" aluminum or copper gaskets. No leaks in 7 years.
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Posted on: 2011/8/18 1:16
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_________________
92 LT1, 6 speed, 3.54 rear, headers, B&B catback, Hurst shifter, polished ZR1 5 spoke wheels, Meziere electric water pump, other mods. |
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| PLRX | Re: what do I put on the threads of the exhaust manifold bolts? | ||
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Senior Guru
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The LT4 FSM calls for 30 lbs-ft.
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Posted on: 2011/8/18 1:19
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Transfer
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| flyboy | Re: what do I put on the threads of the exhaust manifold bolts? | ||
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Elite Guru
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The FSM torque spec. would be for factory gaskets, bolts, etc.
Might it not be different for a performance upgrade? Also, iron vs. alum. heads, don't know what the O.P.'s are. |
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Posted on: 2011/8/18 1:55
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'91coupe, LT4Hotcam, some other stuff. If it's too loud, you're too old. "He works on old cars, then junks 'em" |
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| mistaben | Re: what do I put on the threads of the exhaust manifold bolts? | ||
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Senior Guru
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stock 91 is aluminum I believe, mine are currently AFR190cc's - aluminum too.
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Posted on: 2011/8/18 11:10
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| WW7 | Re: what do I put on the threads of the exhaust manifold bolts? | ||
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Senior Guru
 
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I have to agree with just tightening them up by feel. I have seen to many striped threads in aluminum to trust using a torque wrench on most aluminum parts..The only time I use torque wrenches on aluminum is putting on the intake base. I also don't use antiseize on the exhaust threads....WW
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Posted on: 2011/8/18 23:13
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Transfer
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| flyboy | Re: what do I put on the threads of the exhaust manifold bolts? | ||
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Elite Guru
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Raises a question in my mind about numerous removal, inspection, install of washer type spark plugs using anti-seize in aluminum heads. Not to get off track.
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Posted on: 2011/8/18 23:35
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_________________
'91coupe, LT4Hotcam, some other stuff. If it's too loud, you're too old. "He works on old cars, then junks 'em" |
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| istter1 | Re: what do I put on the threads of the exhaust manifold bolts? | ||
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Elite Guru
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Think of the VW spark plugs blowing out of their heads. They make a Helicoil to put on the spark plug to screw right back in. Aluminum has a heat effect it is a good and bad material around heat.
Steve |
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Posted on: 2011/8/19 0:15
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| mistaben | Re: what do I put on the threads of the exhaust manifold bolts? | ||
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Senior Guru
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Quote:
i've never heard of people using anti-seize on the spark plugs.... I wouldn't do it personally. the spark plugs are really fine thread and use a clean steal thread that gets changed semi-regularly - i.e. a good seat. your exhaust manifold bolts... well, lol, you look at them and they are kind of grody usually coming with a minimum of at aleast a little rust or something on em. lol..... |
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Posted on: 2011/8/19 0:27
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| flyboy | Re: what do I put on the threads of the exhaust manifold bolts? | ||
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Elite Guru
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Quote:
It seems to be generally recommended. Here is one thread of many. http://www.hotrodders.com/forum/anti- ... d-spark-plugs-159537.html |
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Posted on: 2011/8/19 2:07
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| BillH | Re: what do I put on the threads of the exhaust manifold bolts? | ||
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The Stig Moderator
 
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Geeze Guys.
Get the ARP catalog/technical data book. Never put steel into aluminum without antisieze,especially sparkplugs, torque appropiately. Tighten by feel? That's why they sell Helicoils and replacement studs/bolts. |
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Posted on: 2011/8/19 2:23
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Every man dies but not every man lives. |
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| Matatk | Re: what do I put on the threads of the exhaust manifold bolts? | ||
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Webmaster
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Quote:
I always use anti seize on spark plugs  |
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Posted on: 2011/8/19 2:34
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_________________
2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| JeffK | Re: what do I put on the threads of the exhaust manifold bolts? | ||
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Elite Guru
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Quote:
Me too, and on my header bolts. |
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Posted on: 2011/8/19 18:38
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Transfer
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