I've did several searches on this, and came up with a majority vote on not installing 1.880 exh valves intothe 049 oval port heads due to the chances of hitting water. Always thought putting big valves in the 049's was the right thing to do.
Are the chances still there if you go with a valve seat with the same OD as the exhaust valve, or at least close, i.e. .010-.030 bigger?
Example of dimensions
Seat OD - 1.88 + ??
Seat ID - 1.5625
Seat Depth - .3125
If the majority of the vote is against this, what's my alternative? The cast iron is not tempered below the exhaust valve now. Wouldn't this beat the seat up really bad? You could tell when milling the heads that the head material got really soft there.