exhaust manifold bolts - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rddaves54 · 03-04-2009, 12:45 PM

I need exhaust manifold bolts for the head. I bought new manifolds and the old bolts are worn out and rusted away. I went to Chevy dealer they only carry metric. I went to Lowes but was wondering if their bolts would be strong enough? Can anyone tell me where I can get a set for my 350 72 engine? Saw one set on E-bay.

What size washer goes on the bolt to the harmonic balancer? I believe mine has the washer for the big block because it goes over the hole and not into the hole.

**leddzepp** · 03-04-2009, 03:18 PM

www.truckandcarshop.com has the correct manifold bolts. check with a vendor here also, as they might have them as well.

I also used some grade 8 bolts from home depot a few yrs back, and they have held up just fine.

haysonj · 03-04-2009, 03:33 PM

Jegs sells any bolt set you might need.

Longhorn Man · 03-04-2009, 05:00 PM

any grade 5 or better bolt will do. They aren't anything special. Put antiseize compound on them before you install them for the next guy.

cdowns · 03-04-2009, 05:09 PM

if you want a washer that fits into the harmonic balancer why not just use a ruler and measure the diameter of the hole you want the washer to go into?

Wrenchbender Ret · 03-04-2009, 05:25 PM

Most Ace hardware stores have a good selection. I use grade 8 bolts on manifolds & practically everything else. They are identified by 6 lines on the head. The damper washer is a special washer. It has a 7/16 bolt hole & is extra thick. The dealer should have it or the salvage lot.

Tx Firefighter · 03-04-2009, 08:35 PM

I always use normal old grade 8 3/8 inch bolts for my manifolds. Tractor Supply sells them by the pound.

03-04-2009, 12:45 PM	#1
rddaves54 Registered User Join Date: Nov 2008 Location: Columbia SC Posts: 231	exhaust manifold bolts I need exhaust manifold bolts for the head. I bought new manifolds and the old bolts are worn out and rusted away. I went to Chevy dealer they only carry metric. I went to Lowes but was wondering if their bolts would be strong enough? Can anyone tell me where I can get a set for my 350 72 engine? Saw one set on E-bay. What size washer goes on the bolt to the harmonic balancer? I believe mine has the washer for the big block because it goes over the hole and not into the hole.

03-04-2009, 03:18 PM	#2
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 20,022	Re: exhaust manifold bolts www.truckandcarshop.com has the correct manifold bolts. check with a vendor here also, as they might have them as well. I also used some grade 8 bolts from home depot a few yrs back, and they have held up just fine. Last edited by leddzepp; 03-04-2009 at 03:19 PM.

03-04-2009, 03:33 PM	#3
haysonj Registered User Join Date: Dec 2007 Location: Santa Maria, Ca. Posts: 1,423	Re: exhaust manifold bolts Jegs sells any bolt set you might need. __________________ 69 Chevy 4x4 383 Power

03-04-2009, 05:00 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: exhaust manifold bolts any grade 5 or better bolt will do. They aren't anything special. Put antiseize compound on them before you install them for the next guy.

03-04-2009, 05:09 PM	#5
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: exhaust manifold bolts if you want a washer that fits into the harmonic balancer why not just use a ruler and measure the diameter of the hole you want the washer to go into? __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

03-04-2009, 05:25 PM	#6
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,228	Re: exhaust manifold bolts Most Ace hardware stores have a good selection. I use grade 8 bolts on manifolds & practically everything else. They are identified by 6 lines on the head. The damper washer is a special washer. It has a 7/16 bolt hole & is extra thick. The dealer should have it or the salvage lot.

03-04-2009, 08:35 PM	#7
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: exhaust manifold bolts I always use normal old grade 8 3/8 inch bolts for my manifolds. Tractor Supply sells them by the pound. __________________ I'm on the Instagram- @Gearhead_Kevin

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