Exhaust leak

[hanleyclifford]

Studs my friends. The fastening system (hex nuts) is then on the outside of the flange, not buried deep in the manifold. If they want to seize solid in the manifold, don't care anymore.

This follows the same reasoning as the water jacket side plate studs.

As matter of course you should never torque an attachment to an iron casting with a cap screw which strains the threads inside the casting. Always use studs - and always of the same material as the casting.

[hanleyclifford]

Have you figured out WHY the flange is so rusty? Normally there should be no water in it or on it.

The flange is rusty because it is the anode in a galvanic cell. Notice how perfect the ss cap screws appear. Even the 1/8" plug looks good.