Exhaust Manifold Bolt Size?

[SSNAKE]

Swapping out the manifolds for a set of Edelbrock headers. Does anyone know the manifold bolt size for replacement?

Thanks

 

[KenH]

Stock header bolt thread size is 5/16-18. Stock bolts have about 1" of threads with about 3/4" of threads past the built-in cup washer. Stock flange is about 1/4" thick which puts about 1/2" of the bolt threads in the heads.

--- Ken

 

[SSNAKE]

Thank You Very Much, Ken.

 

[Mike Adams]

If you want Stage 8 makes special bolt kits for vipers. I have them in stock they are $70 US for the set plus shipping