Has anyone any ideas on the follow..
(I'll give you a brief history on the problem as it might help people in the future not make the same mistakes)
I bought a replacement valver nearly a year ago after my first one had been writen of due to an accident. I new it had a knackered head when I bought the car ( I wasn't bother as I had a perfectly fine engine sat at home. I was pretty much mistaken in thinking this) Before I fitted the replacement engine I changed the cambelt once the engine was fitted. The cambelt slipped and I ended up bending valves I Then decied to see what could be done with the engine that came with the car. I bought a replacement head and fitted it. Car was fine for about 250 miles then when started it would have no oil pressure for a minute. Decied to do some swapping of parts I dismanteled the engine and swaped the blocks over. Again this was fine for nearly 1000 miles then as I was driving along the road oil pressure was lost and that was the end of that engine. I bought a replacement engine in the end of the summer.
This ran fine till all the water hoses took turns to split. Eventually this has caused the head gaske to blow. In my wisdom I sent the old head of to the garage to be preasure tested. This came back fine so last weekend I fitted the head and was running the engine in (yet again) This time its only managed to do 70 miles before losing oil pressure.
I'm a little reluctant to beleive that 3 seperate blocks that all had good oil pressure would fail with in a month of the same head been fitted so this leads me to believe the head is where the problem lies. I've checked it and carn't find anything wrong. Does any one have any ideas as to what could be the cause?
Thanks in advance