Exhaust manifold bolts?? - ZR-1 Net Registry Forums

rush91 · 05-15-2018

I took my 91 in to get oil change / spark plugs changed. When my mechanic calls back and says there no manifolds bolts, just the manifold bolts stud.....so looking at Jerry's Gaskets I see that GM didn't place any bolts on the 90 - 92s, just the 93-95s......so my question is are hey needed on my stock 91??

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Ccmano · 05-15-2018

There is only one stud per side. The rest are bolts (with sleeves). Likely your mechanic is confused by the fact that not all the bolt holes contained bolts from the factory. Typically only 8-10 bolts (16 holes) were used per side. Both my 90’s had bolts.
H

A26B · 05-15-2018

Quote:

Originally Posted by rush91

I took my 91 in to get oil change / spark plugs changed. When my mechanic calls back and says there no manifolds bolts, just the manifold bolts stud.....so looking at Jerry's Gaskets I see that GM didn't place any bolts on the 90 - 92s, just the 93-95s......so my question is are hey needed on my stock 91??

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That's not quite right.... GM DID place bolts on the 90~92, 6 bolts, in addition to the single stud/nut.

Looking at the diagram, you will notice that there were 6 bolts in addition to the stud/nut on 90~92 models. The rest of the holes were empty.

93~95 models omitted the stud/nut and added 2 more bolts (1 on each side of where the stud/nut was on the 90~92 models, bringing the total to 8 bolts.

http://www.jerrysgaskets.com/bolt-ex...old-90-95-1d2/

rush91 · 05-15-2018

Quote:

Originally Posted by Ccmano

There is only one stud per side. The rest are bolts (with sleeves). Likely your mechanic is confused by the fact that not all the bolt holes contained bolts from the factory. Typically only 8-10 bolts (16 holes) were used per side. Both my 90’s had bolts.
H

Thanks....that's what I was getting from Jerry's info on his site. So would it be stupid to put bolts in those holes? I know down the road I will do headers, which would require all the bolts.

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jss06c6 · 05-15-2018

When I installed my SW headers, I put all but one (bolts) and one stud nut on. Running copper gaskets. 2 years since install. No leaks..

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05-15-2018	#1
rush91 Join Date: Feb 2016 Location: Carterville Illinois Posts: 854	Exhaust manifold bolts?? I took my 91 in to get oil change / spark plugs changed. When my mechanic calls back and says there no manifolds bolts, just the manifold bolts stud.....so looking at Jerry's Gaskets I see that GM didn't place any bolts on the 90 - 92s, just the 93-95s......so my question is are hey needed on my stock 91?? Sent from my XT1585 using Tapatalk

05-15-2018	#2
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,843	Re: Exhaust manifold bolts?? There is only one stud per side. The rest are bolts (with sleeves). Likely your mechanic is confused by the fact that not all the bolt holes contained bolts from the factory. Typically only 8-10 bolts (16 holes) were used per side. Both my 90’s had bolts. H __________________ [B]90'ZR-1[/B] #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold [B]08 C6 Z51[/B] Crystal Red Metallic Sold Vararam Intake, Tune, Sold [B]05 C6 Z51[/B] Red/Black Sold [B]90'ZR-1[/B] #1723 Black/Gray Sold but not forgotten [B]91' Z51 L98[/B] White Vert. My First, you always remember your first. Sold.

05-15-2018	#5
jss06c6 Join Date: Aug 2015 Location: Magnolia, Texas Posts: 884	Re: Exhaust manifold bolts?? When I installed my SW headers, I put all but one (bolts) and one stud nut on. Running copper gaskets. 2 years since install. No leaks.. Sent from my QTAIR7 using ZR-1 Net Registry mobile app