Remove the head, Grind it flat and replace it using a new gasket.
theres no way you can change the head gaskets without taking off the intake manifold, its not hard to do. plus if your going to change the head gaskets it would only be smart to change the intake gaskets also.Answerand if your talking about the exhaust manifold, you did'NT specify, I'm sure you can but it will be no fun at all, plus u should change exhaust gaskets if your going to do all that work anyways so you don't have to worry about them down the road.
yes
Burnt valve, blown head gasket, bad plug wire.
Probably not.
From everything I see the 125 is a 42" mower with a 20HP engine. The STX-38 mowers were 38" with either a 12.5 or a 13HP engine. So, yes the 125 is bigger than the STX-38.
The Aerostar never had a 3.8 liter. It had a 4.0 or a 3.0. So maybe you need to improve the question.
No, not unless you want to destroy your engine.
A wiring schematic for a ford 38 engine can be found through Ford related service manuals. The manuals depict the original factory placements of the harness and parts of the engine.
caliber 38 is a caliber 38. bullet dia. is .357 caliber deals with the dia. or measurement around the bullet head, not the bullet case.
38 - 46 quarts, depending on what the engine is.
HEAD: 33-38 cm Chest: 12-14 inches
I use 38 thou