Exhaust manifold bolts?

[Low84]

Where are you guys getting them from? I went to O'Reilys and Autozone and both want to sell me m10 x 1.5. I am under the impression that it's supposed to be a m8 x 1.25. They both told me I was wrong and those were ford bolts. I bought the m10 and they were indeed too big?

What's the right size and where do you guys get them from?

[BR3W CITY]

From manifold to collector flange
or
from head to header flange?

[smoky02]

Seems like I ordered mine off of Amazon...or maybe they came with my headers...go to LS1truck, or LS1tech, and check in the for sale threads, I'm sure someone there can hook you up.

[Wasted Income]

M8 x 1.25 thread. Dorman part # 03413B GM part # 11518860

The earlier engines had bolts that fit a 10mm socket. The newer engines use bolts that fit a 13 mm socket.

[Billett]

Mine came with the headers, but they are indeed M8x1.25. ARP sells a set for $30

[Low84]

I should have mentioned it earlier. Yes, head to flange

Thanks for the help fellas, especially for part #'s

[BigRed76]

I've seen way too many factory exhaust manifold bolts broken on LS engines, I'd go with the ARP's...you can get them from Summit, JEGS, Speedway, etc.

[Billett]

I actually put a small dab of anti-seize on the tips then check the torque every time I do an oil change. Takes another 10 mins and I rarely have one back out, but at least I know they'll be easier to get out of the aluminum when I need them to.

[Wasted Income]

^ LOL....damn man. Taking preventative maintenance to a new level.

I rip them down with the cordless impact, go out and beat on the truck till the manifolds are glowing red....rinse and repeat.

Never broken a manifold bolt on any of the 6 LS swaps I've done. However it's weird how almost every swap engine I start with has at least one broken bolt...usually the one on the driver side closest to the firewall.

[crazy longhorn]

Originally Posted by Low84

Where are you guys getting them from? I went to O'Reilys and Autozone and both want to sell me m10 x 1.5. I am under the impression that it's supposed to be a m8 x 1.25. They both told me I was wrong and those were ford bolts. I bought the m10 and they were indeed too big?

What's the right size and where do you guys get them from?

Did you find what you need....or need a set? I have a set that came with the hooker headers(3/8", thick flanges)....should be about right for your stock manifolds? I went studs/nuts on mine...if you need the bolts, shoot me a PM, & I will mail em to you. Longhorn

[Low84]

Thanks. Yeah I did. I Couldn't get the people at the store to find it with part number and all. Online shipping was more expensive than the bolts so I just went with the ARP from Jegs with free shipping.

[crazy longhorn]

Good deal....the studs/nuts were not cheap (stainless), about 125 for the set (ouch), but I will probably pull the headers once a season for blast/repaint. Longhorn

[solidaxel]

Originally Posted by crazy longhorn

Good deal....the studs/nuts were not cheap (stainless), about 125 for the set (ouch), but I will probably pull the headers once a season for blast/repaint. Longhorn

Are there no Jet Hot coating companies in your area, or are you against coatings, seems like a lot of work

[crazy longhorn]

No coaters in my area , that I know of? As far as the work....its a labor of love 29 yrs, I have played with that old truck, many other toys also (sandrail,motorcycles,5.0 stang, several trucks...including a v8 swap in both S-10 & ranger.... The 69 was the only one I have kept that long! I guess that the blood runs deep Longhorn