Hello,

I am about to swap my exhaust system. Since it is not so easy to get inch threaded bolts around here I want to have the hardware complete before I start the project.

Unfortunately I did not find anything about the exhaust to manifold bolt size.

Does anybody know which size the bolts have which are tighten the exhaust down pipe to the exhaust manfolds?

1969 Cutlass 350 with original exhaust manifolds.

Thanks a lot

Greetings from Germany

 

3/8 x 16 thread

 

Thanks a lot!