No exhaust manifold gaskets when removed? do they need milled? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

weider1717 · 04-20-2013, 10:58 AM

Removed for the 1st time my 87's manifolds restored them now ready to put them back on there were no gaskets when I removed them. Should I take them to a machine shop and have them milled incase they're warped any? or do they usually not leak when put back on?

thanks

motornut · 04-20-2013, 12:24 PM

I'd use a steel ruler or other straight edge to check
run it flush across them all
not sure if you would benefit from running small grinding wheels inside to clean up casting marks etc
fine sand paper the mating surfaces
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88Jimmy4x4 · 04-20-2013, 12:27 PM

buy the gaskets and put them on, they should have them. I restored mine and used gasket from kit and I have no leaks.

weider1717 · 04-20-2013, 12:55 PM

Quote:

Originally Posted by 88Jimmy4x4

buy the gaskets and put them on, they should have them. I restored mine and used gasket from kit and I have no leaks.

when you removed yours are you saying they had gaskets or no? maybe mine have been off before but I really don't think they have.

Tx Firefighter · 04-20-2013, 12:56 PM

They never had gaskets originally but it's standard procedure to put gaskets in once they've been removed the first time. I wouldn't worry about having them planed. They don't usually warp appreciably enough to cause sealing issues when used with gaskets.
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donut · 04-20-2013, 08:14 PM

My '86 called for copper RTV for the gaskets. Checked when I was trying to fix exhaust leaks.

04-20-2013, 10:58 AM	#1
weider1717 Registered User Join Date: Apr 2011 Location: greenville sc Posts: 558	No exhaust manifold gaskets when removed? do they need milled? Removed for the 1st time my 87's manifolds restored them now ready to put them back on there were no gaskets when I removed them. Should I take them to a machine shop and have them milled incase they're warped any? or do they usually not leak when put back on? thanks

04-20-2013, 12:24 PM	#2
motornut 78K & 79C Jimmys Join Date: Nov 2009 Location: Ottawa Ont CANADA Posts: 7,901	Re: No exhaust manifold gaskets when removed? do they need milled? I'd use a steel ruler or other straight edge to check run it flush across them all not sure if you would benefit from running small grinding wheels inside to clean up casting marks etc fine sand paper the mating surfaces Posted via Mobile Device __________________ John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350

04-20-2013, 12:27 PM	#3
88Jimmy4x4 Registered User Join Date: Oct 2003 Location: houston, texas Posts: 1,974	Re: No exhaust manifold gaskets when removed? do they need milled? buy the gaskets and put them on, they should have them. I restored mine and used gasket from kit and I have no leaks. __________________ 2008 Silverado Z71 RCSB 1991 GMC Jimmy 4x4 1976 GMC Sierra C15 SWB

04-20-2013, 12:56 PM	#5
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: No exhaust manifold gaskets when removed? do they need milled? They never had gaskets originally but it's standard procedure to put gaskets in once they've been removed the first time. I wouldn't worry about having them planed. They don't usually warp appreciably enough to cause sealing issues when used with gaskets. Posted via Mobile Device

04-20-2013, 08:14 PM	#6
donut Registered User Join Date: Aug 2009 Location: S.C. Posts: 1,593	Re: No exhaust manifold gaskets when removed? do they need milled? My '86 called for copper RTV for the gaskets. Checked when I was trying to fix exhaust leaks. __________________ '86 C-30 dually, 454/tbh400 '73 K-20 350/350/205 (sold ) I'm kinda like duct tape- no real purpose, but handy to have around.



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