Packard Forum Index » Pre-War (1899-1942)

I bought an intake and exhaust manifold the 3 bolts that hold it together are missing. Are they special bolts or will grade 5 bolts work.

Grade 5 is fine

Remember, too, that part of a complete tune up in the day was to check head and manifold torque engine warm (given iron head). But don't overdo; some folks don't back off quickly enough when click heard.
And you want the manifold to be able to expand and contract.

Be thankful our 356 engines have one-piece manifold, not three-piece a la Buick 320 straight eight.