posted on Sep, 27 2019 @ 07:29 AM
So many Johnny-don'ts around here.
If you're rebuilding a dodge I'm going to assume you don't need this engine to work- you just want it to.
I'm also going to assume you're doing this because you can, not because you need to.
Last assumption, if you've got a k-car you probably have some other junk laying around.
So, here's how I'd tackle that valve seat.
One, get yourself a mapp gas torch. If you don't own one, get on that. Yellow bottle, same thread as the little green propane tanks.... same torch
head too. You'll learn to love this torch setup.
Two, find some junk aluminum and torch the # out of it. You'll find out that mapp gas CAN melt that aluminum- just not very easily. Feel the heat, and
be mindful when torching your aluminum head. I doubt you'd be able to soften up a head enough to damage it with a handheld torch... but I've never
tried. Aluminum will suck the heat away too fast, probably.
Now, head back into the same junkyard you got that k-car from (back yard?) and find a propane grill you don't care for. Cut off the gas line- you want
the fitting that goes on the tank, and a few feet of tube. Find a tank that's at least half full, too.
Jimmy jack a way to put that tank upside down while you can still get to the on/off valve.
When you open that valve, the regulator and line are going to get very cold, very quickly. Liquid propane is a real bitch, don't get it on you.
Anything it touches will get VERY cold as it evaporates.
So- now you have a torch that gets things hot as hell, and a liquid that gets things very cold.
Heat expands metal, cold makes it shrink.
First thing I'd do is heat the # out of that valve seat. the heat will sink into the metal around it. If you can touch the head with your bare skin
after this, its probably not hot enough.
Then, uh... carefully... spray the valve seat with liquid propane. Note that it might explode a little bit.
Eyebrows not withstanding, get a dental pick or similar and I bet you can scoop that seat right out.
Then, go have a beer and relax for half an hour while the smell of burnt hair wafts away.
third generation shade tree problem solver
15 years experience