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You are watching: 5.7 vortec exhaust manifold bolt size


I am looking to change my exhaust manifold-to-head mounting bolts with grade 8 hardware. Engine is a 1990 TBI 350 v the stock serpentine setup and also manifolds. I"m help a friend obtain this engine running, and we basically began with a crate of components so we"re not completely sure what is what.What I need to recognize is the specs that the bolts themselves. I understand they space 3/8" however length? Also, I think there is a stud in every manifold, probably for the accessories. Dimension of those?Thanks,Brendan
I to be looking to change my exhaust manifold-to-head mounting bolts through grade 8 hardware. Engine is a 1990 TBI 350 with the stock serpentine setup and also manifolds. I"m helping a friend get this engine running, and we basically began with a box of components so we"re not completely sure what is what.What I require to understand is the specs that the bolts themselves. I understand they space 3/8" but length? Also, I believe there is a stud in every manifold, possibly for the accessories. Size of those?Thanks,Brendan
3/4 inch or 20 mm depending. Why great 8? these things only spec come 25 foot pounds, not precisely a difficulty for a 3/8s bolt. Plus they rust, acquire some stainless steel and also make the following removal a lot of easier, same goes through the bolts or studs that connect the head pipes to the manifold, stainless, so you can gain it apart next year.Bogie
Why grade 8?
this things just spec come 25 foot pounds, not specifically a an obstacle for a 3/8s bolt. Plus castle rust, get some stainless steel and also make the following removal a lot of easier, very same goes through the bolts or studs that affix the head pipes come the manifold, stainless, so girlfriend can gain it apart next year.

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Ayuh,... The SSteel idea is a good 1,...I"ve done a couple of with steel studs,+ Brass nuts.... Just due to the fact that of the Rust factor...
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