Thanks Swifty for your help, and all the rest of the post too.
Well, having had lots of much-needed advice on what the problem could be, I have done a bit of thinking, and tried to figure out what it could be.
The two rear cylinders have such good compression that logically, I would assume that both rings and valves are in good order.
The front two are so low on compression, it would be against all odds to imagine that TWO separate lots of rings or valves have failed at exactly the same time, so I will stick my neck out and say that logically, I think the head gasket between the front two pots has blown.
And also. I would think that the gasket blew before I cooked the engine, And that is what caused the breakdown in the first place.
hope to start a strip-down in the next couple of days, so will post in due course.
(I was secretly hoping that Swifty's scenario of the tappets coming loose on one and two would be the answer, but the odds on that happening I thought would be far too high!!) Boo-Hoo!!
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