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 exhaust manifold bolt spacers- why?

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lamune

lamune

Posts : 791
Join date : 2014-05-09
Location : Seattle

exhaust manifold bolt spacers- why? Empty
PostSubject: exhaust manifold bolt spacers- why?   exhaust manifold bolt spacers- why? Icon_minitimeTue Jul 15, 2014 3:16 am

Is there any particular reason why on these LT1 motors that some of the bolts are 3/8-16x1.5 with a half inch spacer, and some are just 1 inch bolts without?

Also on my particular car, there are 3 studs, only one of which is actually used for anything (alternator bracket) - so I may just replace those with bolts. Only thing I can think of is that the studs are there to hold the gasket in place during assembly, assuming the nut is supposed to come off. It looks like it may be permanently attached, though.
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95BRMW

95BRMW

Posts : 1679
Join date : 2009-08-15
Age : 37
Location : Connecticut

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PostSubject: Re: exhaust manifold bolt spacers- why?   exhaust manifold bolt spacers- why? Icon_minitimeTue Jul 15, 2014 10:00 am

The spacers had something to do with thermal expansion. Not sure how much they helped as the rears break off anyways
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sherlock9c1



Posts : 2308
Join date : 2009-05-28
Location : Huntsville, AL

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PostSubject: Re: exhaust manifold bolt spacers- why?   exhaust manifold bolt spacers- why? Icon_minitimeTue Jul 15, 2014 11:24 am

I will say this, having spacers on the bolts allows you to remove the shaft with vice grips without having to remove the exhaust manifold if it's just the bolt head that pops off. When I replaced my exhaust manifold bolts, I used longer bolts and put spacers on ALL of the bolts for that exact reason.
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lamune

lamune

Posts : 791
Join date : 2014-05-09
Location : Seattle

exhaust manifold bolt spacers- why? Empty
PostSubject: Re: exhaust manifold bolt spacers- why?   exhaust manifold bolt spacers- why? Icon_minitimeTue Jul 15, 2014 2:20 pm

That's what I was thinking as well, just use spacers for all.
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Fred Kiehl

Fred Kiehl

Posts : 5913
Join date : 2009-11-13
Age : 72
Location : Largo, FL 33774

exhaust manifold bolt spacers- why? Empty
PostSubject: Re: exhaust manifold bolt spacers- why?   exhaust manifold bolt spacers- why? Icon_minitimeTue Jul 15, 2014 10:48 pm

Use grade 8 bolts while you are at it, and put anti-seize on them.
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lamune

lamune

Posts : 791
Join date : 2014-05-09
Location : Seattle

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PostSubject: Re: exhaust manifold bolt spacers- why?   exhaust manifold bolt spacers- why? Icon_minitimeWed Jul 16, 2014 12:43 pm

Fred: already in the plan. Smile

Anyone know where to get these steel spacers? The GM ones are crazy expensive. I may try the motorcycle parts place, I think they have those exact things (but chromed.)

Searching online so far hasn't been very helpful- too much noise in the signal.
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95BRMW

95BRMW

Posts : 1679
Join date : 2009-08-15
Age : 37
Location : Connecticut

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PostSubject: Re: exhaust manifold bolt spacers- why?   exhaust manifold bolt spacers- why? Icon_minitimeWed Jul 16, 2014 7:32 pm

Not sure on the length, but you can get them fairly cheap from mcmaster
http://www.mcmaster.com/#unthreaded-steel-spacers/=sv8vft
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lamune

lamune

Posts : 791
Join date : 2014-05-09
Location : Seattle

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PostSubject: Re: exhaust manifold bolt spacers- why?   exhaust manifold bolt spacers- why? Icon_minitimeThu Jul 17, 2014 1:01 am

Thanks! Smile
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exhaust manifold bolt spacers- why? Empty
PostSubject: Re: exhaust manifold bolt spacers- why?   exhaust manifold bolt spacers- why? Icon_minitime

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