Blown manifold gasket I think

[ShawnAgne]

Went to mow today with the 300 and all of a sudden everything sounded real throaty and there was exhaust venting around the manifold. Assuming it is just a blown gasket. Was going to check the manifold with a straight edge to make sure it isn't warped. If it is, was going to mill it in the bridgeport. Now I'm a HS Physics teacher by trade, but wondering for the people that have done this how do you set it up on the table? Thought I'd ask first before I try and do it on my own. Planning on using my shell mill and taking very shallow cuts.

 

[Gary Dotson]

Check the back side of your manifold. They sometimes rust and burn out. The manifold will look okay at a glance, until you inspect closer. I’m only a hack with machinist equipment, so I have nothing for you on the mill set-up.

 

[ShawnAgne]

Check the back side of your manifold. They sometimes rust and burn out. The manifold will look okay at a glance, until you inspect closer. I’m only a hack with machinist equipment, so I have nothing for you on the mill set-up.

Gary,
Ended up the exhaust pipe was just sitting in there didn't have any threads holding it on. Previous owner and installed some set screws. SOOOO have a new manifold coming.