1965 273 A body exhaust manifold to cylinder head bolt size

krazykuda said
I thought they were 5/16" - 18 coarse thread going into the head...

The studs in the ends should be 5/16" x 1 1/2", 2" length may be a little too long...

We already have the 4 studs. So all we need are the bolts and nuts and washers.

thank you everyone for all the information. Eric