Exhaust Manifold Bolts - The 1947 - Present Chevrolet & GMC Truck Message Board Network

85Silverado · 12-19-2002, 07:00 PM

Can I get these at an auto parts store? I was tracing my "knock" sound and I felt exhaust puffing from behind the passenger side exhaust manifold and went to tighten the bolts and I'm missing the second bolt from the back. Can I get a replacement bolt from the parts store? Or will i have to go yardin'? Thanks

**swervin ervin** · 12-19-2002, 07:23 PM

It will be a 3/8" x 16 thread bolt. Nothing special, except the length. I don't remember what length they are off hand though. You could get them at a hardware store but I'm not sure of the grade they are either. I would also say, they could be bought from the dealer, but get ready to pay a crazy price for them. GM likes their stuff a lot.

I've probably got some in my shop, but finding them would be next to impossible.

85Silverado · 12-19-2002, 07:43 PM

nuts...er..bolts..hehe

I think this might fix my knock sound...i had a '85 elky that the manifold bolt on the driver's side got loose and made a knocking sound. Would the bolts be the same length as the other ones? Or should I just a buy a few of that spec in different lengths and just compare once i get home? I can't see grade 8 bolts costing more then a few bucks all together.

**swervin ervin** · 12-19-2002, 07:55 PM

Yep, just compare them to the other ones and get the same length. Grade 8 would work nicely.

TX_Mudder · 12-20-2002, 10:08 PM

I think I'd go grade 5 for exhaust manifold bolt.
-- Mike

12-19-2002, 07:00 PM	#1
85Silverado Registered User Join Date: Dec 2002 Location: Milwaukee, Wisconsin Posts: 198	Exhaust Manifold Bolts Can I get these at an auto parts store? I was tracing my "knock" sound and I felt exhaust puffing from behind the passenger side exhaust manifold and went to tighten the bolts and I'm missing the second bolt from the back. Can I get a replacement bolt from the parts store? Or will i have to go yardin'? Thanks __________________ Paul D. '78 C20 Scottsdale 350ci 3 speed with granny gear 14 bolt rearend My trucks are "Car-Guy safe".......which pretty much means death trap in the hands of a normal civilian.

12-19-2002, 07:23 PM	#2
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	It will be a 3/8" x 16 thread bolt. Nothing special, except the length. I don't remember what length they are off hand though. You could get them at a hardware store but I'm not sure of the grade they are either. I would also say, they could be bought from the dealer, but get ready to pay a crazy price for them. GM likes their stuff a lot. I've probably got some in my shop, but finding them would be next to impossible. __________________ Mike 1985 Chevy C-10

12-19-2002, 07:43 PM	#3
85Silverado Registered User Join Date: Dec 2002 Location: Milwaukee, Wisconsin Posts: 198	nuts...er..bolts..hehe I think this might fix my knock sound...i had a '85 elky that the manifold bolt on the driver's side got loose and made a knocking sound. Would the bolts be the same length as the other ones? Or should I just a buy a few of that spec in different lengths and just compare once i get home? I can't see grade 8 bolts costing more then a few bucks all together. __________________ Paul D. '78 C20 Scottsdale 350ci 3 speed with granny gear 14 bolt rearend My trucks are "Car-Guy safe".......which pretty much means death trap in the hands of a normal civilian.

12-19-2002, 07:55 PM	#4
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Yep, just compare them to the other ones and get the same length. Grade 8 would work nicely. __________________ Mike 1985 Chevy C-10

12-20-2002, 10:08 PM	#5
TX_Mudder Registered User Join Date: Jun 2001 Location: Houston, TX Posts: 126	I think I'd go grade 5 for exhaust manifold bolt. -- Mike __________________ http://home.houston.rr.com/chevy73/

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