Exhaust Manifold stud/nut - ZR-1 Net Registry Forums

Livin' in the 80's · 03-22-2017

In checking the block numbers on my new purchase, I discovered by accident that it is missing a rear exhaust manifold stud and nut/other hardware. Is this typical and are there other bolts and fasteners to look for that loosen on these ZR1's? I will be checking the others to see if they are tight.

Where would I get the original hardware or would anyone have some from an exhaust swap that they would want to part with? I would want at least two sets in case there are any more that I haven't checked

-=Jeff=- · 03-22-2017

Keep in mind I doubt any ZR-1 with OEM manifolds has all the bolts in them as not all the bolts were installed originally

efnfast · 03-22-2017

Each of our manifolds have 16 bolts, regular SB chevy has 6 (i think) on each side.

A26B · 03-22-2017

I think everyone who first looks at their "new" ZR-1 notices all the missing bolts in the exhaust header flange, including me. In actuality, they were never installed.

Here's a link to an image on my website regarding exhaust manifold bolt placement. Nice thing is,,,, all the holes are tapped in the cylinder head which is a good thing when headers are installed.

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

Livin' in the 80's · 03-22-2017

Quote:

Originally Posted by A26B

I think everyone who first looks at their "new" ZR-1 notices all the missing bolts in the exhaust header flange, including me.

Here's a link to an image on my website regarding exhaust manifold bolt placement. Nice thing is,,,, all the holes are tapped in the cylinder head which is a good thing when headers are installed.

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

Would it hurt to put in the missing bolts in the stock manifolds in the miss g holes?

A26B · 03-22-2017

It wouldn't hurt anything, but why bother doing if not leaking?

Sent from my iPhone using ZR-1 Net Registry

Livin' in the 80's · 03-22-2017

Quote:

Originally Posted by A26B

It wouldn't hurt anything, but why bother doing if not leaking?

Sent from my iPhone using ZR-1 Net Registry

Good point. Thanks for the information. You would think with the stress of everything, more bolts would be needed. I have seen plenty of gm products loosing or breaking bolts holding the exhaust manifolds on.

03-22-2017	#1
Livin' in the 80's Join Date: Feb 2017 Location: Southbury CT Posts: 101	Exhaust Manifold stud/nut In checking the block numbers on my new purchase, I discovered by accident that it is missing a rear exhaust manifold stud and nut/other hardware. Is this typical and are there other bolts and fasteners to look for that loosen on these ZR1's? I will be checking the others to see if they are tight. Where would I get the original hardware or would anyone have some from an exhaust swap that they would want to part with? I would want at least two sets in case there are any more that I haven't checked __________________ :Eagle:[URL=http://s653.photobucket.com/user/craigwhite84/media/Kelly%20Boat/IMG_0468a_zpso50qvl1y.jpg.html][IMG]http://i653.photobucket.com/albums/uu256/craigwhite84/Kelly%20Boat/IMG_0468a_zpso50qvl1y.jpg[/IMG][/URL] 1990 ZR1 Black/Black #2317

03-22-2017	#2
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,169	Re: Exhaust Manifold stud/nut Keep in mind I doubt any ZR-1 with OEM manifolds has all the bolts in them as not all the bolts were installed originally __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978

03-22-2017	#3
efnfast Join Date: Nov 2011 Location: Dunbarton NH Posts: 7,480	Re: Exhaust Manifold stud/nut Each of our manifolds have 16 bolts, regular SB chevy has 6 (i think) on each side.

03-22-2017	#4
A26B Join Date: Dec 2003 Location: Arcadia,OK Posts: 3,394	Exhaust Manifold stud/nut I think everyone who first looks at their "new" ZR-1 notices all the missing bolts in the exhaust header flange, including me. In actuality, they were never installed. Here's a link to an image on my website regarding exhaust manifold bolt placement. Nice thing is,,,, all the holes are tapped in the cylinder head which is a good thing when headers are installed. http://www.jerrysgaskets.com/bolt-ex...old-90-95-1d2/ __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. Last edited by A26B; 03-22-2017 at 04:44 PM.*

03-22-2017	#6
A26B Join Date: Dec 2003 Location: Arcadia,OK Posts: 3,394	Re: Exhaust Manifold stud/nut It wouldn't hurt anything, but why bother doing if not leaking? Sent from my iPhone using ZR-1 Net Registry __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.