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Old 03-09-2024, 07:06 PM
Burbach 174 Burbach 174 is offline
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Join Date: Aug 2021
Location: Sioux Falls
Posts: 22
Default 60 389 Exhaust Bolt size mystery

I'm getting ready to remove the exhaust manifolds so I can get to the freeze plugs more easily but assuming I'll want to replace the manifold bolts, I'm not finding any information about them. All the vendors list 64 and up!
So dopes anyone know what the difference is and perhaps the diameter is different than later 389 blocks?
I did confirm going BACK TO 55 they should be the same but still can't find the bolt information w/o a parts book... Thank you!

 

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