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Only one way to be sure...as said above, take it apart.

If they are early 360 and don't need any work, I think that's ballpark value.

great info and write up..........thanks

Excellent info and great write up.

I believe there was no gaskets used from the factory between the exhaust manifolds and the block. They were just bolted up. Have the surfaces machined true so there isn't any exhaust leaks.

Hey Snake, I used straight 10w30 Royal Purple break in oil. Didn't add any other kind of additive bottle. The zinc is already added in the break in oil for these older motors. Just pour it in.