I got a Cressida for free today off some old asian dude, Its in alright mechanical order for its age, its a '89 and has 225,000kms on the clock. The thing is it hasn't had an oil change for those 225,000kms, I asked old guy if it had been serviced regularly and he said he only ever topped the oil up when it got low. I did a compression test and rings etc are fine, no rattle from bearings either. Changed oil, went black instantly, ripped off rocker cover and well its an interesting sight under there, solid black pretty much. Took head off and sent it to get crack tested, hardness tested and acid bathed. So now I have a block with dirty oil in it and I am wondering what i should do, can I clean out the block? Should I remove sump etc and clean inside with petrol or something?
Knowing my luck when its all cleaned it'll blow up because its not used to it
Thoughts please.