Originally Posted by barry123400

Well I really did not want to be a so called winner about your situation.As I see it there are several possibilities and perhaps several arangements possible.

It seems to me now as hindsight is always so great. The piston rings are somewhat more relaxed when not under heavy load. In theory the blowback pressure should further increase otherwise when running rpms and higher occur.

Instead it is actually lowering. I guess this could be verified if desired with a simple gauge. There is a slight chance something is wrong with the shutoff device making it too sensitive as well.

It is almost a certain given that during the intial attempted start up the presure is pushing the shutoff assembley closed with the internal base pressure in the engine.

Or you are not getting a good normal no vaccum present at the cut off somehow or other when attempting to start. So the first cold engine test would be to disconnect the vacuum line prior to attempting to start the engine.

Some of these cars will retain residual vacuum for a day or so. Simple test really just in case as still in my mind the blowby pressure should be increasing as the engine really starts to run.

That would kill the engine for sure with your symptoms. Or perhaps when engine is actually started the splashed oil on the cylinder walls improves the seal is about the only alternative.

If it is the initial blowby proven by the simple test. You could rig a choke cable to hold the shut off on to get started. There is even a convienient handle to attach it to.

Any other solution to keep the old engine working would mean blowing more oil vapors out. This in my opinion means feeding a second breather hose into the system to deal with the initial blowby if that proves conclusivly to be the issue. In your case I would go for the choke cable. How much milage does this engine average on a quart of oil? It would not suprise me if it is not all that bad.