Slant 6 Exhaust Manifold Washers

RustyRatRod said

Here's you a great resource for bolt sizes and thread pitches. You should bookmark it.
Fastener Size Tables | MechaniCalc

Click to expand...

My new intake manifolds front hole is smaller than my original . So a 3/8 bolt will not go thru it , but thr original does . I’m welding up a stud that has the 3/8 threads but rest of it 5/16 . But that’s not what’s on there originally