Oldtech

What Model? 4 or 6 cylinder.

The REC is for recirculate, as opposed to fresh air. Shuts off the outside air intake. Doesn't look GM to me.

Base out. so the fluid goes back to the bottom.

Quote: If you are going to "drive the problem" out of the car, you need an additive that works on sticking rings. Lots of snake oil out there. Not sure what is better than another. Just put a cupful of ATF in the gas tank with at least a half full tank and see what happens .

I would definitely give it a good hone job and a new set of rings.

This should be an ordinary engine to rebuild as it is all shell bearings. The main issue will be finding parts.

What ring is broken? A top one? . Do the rings look new are are they worn? Put one in a cylinder and push the piston in to make it square, and push it down below the nrmal ring travel, then measure the gap with a feeler gage. Original gap would likely be in the .010 to .012 range so... if you now have .030 gap, subtract the .010 means it is worn .020 divide by 3.14 or .006. That I would replace. I would only reuse them if they are almost new. Others will have other ideas i'm sure. The second thing is why it broke. Do you have a ridge reamer? There may be enough ridge on the cylinder to break it. Any piston damage?

Check the valve clearance first. Valve(s) may be being held open.

I would call it a buggy wrench.

I agree not T.

The exhaust angle is different on the later one. It will fit, as far as fit goes but you have to modify the ex pipe.

Agreed. 49 or 50

The tank originally mounted on the engine manifold. I never thought that was the best place 'cause of the heat. Later they mounted on the firewall. Depending what you want for originality, there should be brackets for both.

Could be for a combine or tractor. Look like the ones on Father's ol' Massey 21.

Check the spark at the plug. Pull a wire off and situate it 1/4 inch from a headbolt and have someone spin the engine. You should get a good spark every 2 revolutions. Set the timing so that with the spark lever retarded, the points open just at, or slightly after TDC.