Have 7.3 PS 1999.

[B-85]

I have the heads off my 7.3 looking for a bad gasket or cracked head? I got her hot.About 190,000 miles.Is this a good time to go to a 4" exhaust?
I am not a big time power nut. Just was thinking better flow would be good. Input?

[usnavyad]

Any time is a good time for better airflow it will lower you egts how do the heads look how are the valves

[B-85]

Port head, chamber 2,3, exhaust valves have some rust. Bore is OK ,some water stains.Some rust pitting on head face,chamber top.This may have been a long time leak,it just got pushed when i got it HOT.Head is out now for a lookover and repair or replacment.

[usnavyad]

Good deal it would be cool if you could post some pics

[B-85]

Found the drain on the drivers side. It is the ----------------------------------------------------------------------------------------------------------------Block heater!! Dua! I was looking down the side of the block and saw the wires going to it and said, that must be the block heater.