Any chance of using this stuff to clean the valve seats?

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I can not think of any way to apply it to the valve seats in enough concentration if at all. Both exhaust or intake. One poster mentioned it helps some things by introducing it into the fuel tank. I still wish I knew what this stuff is. A lot of people seem to have experienced positive results. The product has always been marketed as long as I can remember. I suspect it is not snake oil.The newer penatrating oils have a strong acid base. Perhaps this product is an earlier version of them?

thanks for the ideas, I'll look into the marvel oil and get it soaking. I'll update the thred as things progress.

Thanks for that. If they will not soak loose one way or another I have been toying with an engineers ideal to blast them loose. All other easy possibilities should be exhausted first.
I do not really have a firm opinion if they would just loosen up over time by driving. Somehow I suspect not.
Also I do not know if coke deposits are hard enough to score the walls.I suspect not. I really like the possibility of the marvel oil softening or dissolving the deposits first if possible.
You might wish to turn the crank 1/4 turn every other day. A better chance of soaking the compression rings on all the pistons. The pistons near the top of the bores possibly have the rings at their greatest distance from the walls because of the cylinder taper.
The other thought is the position is irrelevant. The rings cannot rock a little to allow sealing because they are glued in with coke. If your car is outside remember chemical activity really slows at low temperatures to almost nothing so try to be patient.
I might take an old coke coated glow plug and stand it in a small cap of the miracle oil to check periodically how much effect it is having on the coke. The burnt out plugs might be ideal for this. You cannot see inside the engine. . I would do two separate old glow plugs that way. One I would leave outside to duplicate the rate of penatration of the coke by the oil and the results. The second one I would keep in the house as the increased chemical action at elevated temperatures will show the end result of the miracle oil in the engine well in advance. Plus provide a baseline for what the oil can achieve.
This whole thing should be interesting. I will also try to find out how other people have dealt with this problem if they have at all over the next few days.

after the soaking i would pull the car to get it started. then i would drive it out on the highway for a couple of hours. i would put a quart or so of marvel mystery oil in the fuel along with some injection cleaner. this might well clean the rings out if they are gunked up.

then i would try the compression test again.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

I like tom's ideal if the rings will not loosen up enough to start the car. The reason I am posting this morning was to mention that at lower temperatures almost any type of chemical will not be very active. You can use the block heater to keep the temperature high enough to allow the mystery oil to have a chance. Or leave the car in a heated space. Outside at say 40 F or lower is almost useless. I think below about 60 deegrees F chemical action becomes extremely slow to non existant. I also think the block heater might produce a cylinder temperature of seventy or more if it is not too cold where you are. Higher would even be better.

by pull start do you mean pop start? If so it is an automatic. If not, do you mean some lawn-mower reference?

Thanks for the tips on heat, today, I'll open the injectors and possibly the valves to inspect/ adjust. In San Francisco, it's gonna hit 60 today, and I'll put the block heater in as soon as it arrives.

as for the highway drive( seems a lofty goal at this point) should I fear for my dry suspension pump? Has MB thought that through and made a safeguard for it. The high pressure hose is blown and I don't want to replace/ fill it till this engine looks more promissing.

Thanks again,
Matt