My head was porous so I opened to change the head with a cosworth one tha I found, and also to rebuild.
The mechanic told me that the engine was very dirty from old oil remains.
The reason that he told me is that the previous owner didn't change the oil never, or because the engine was many years in immobilyte on second hand parts. From this dirty, two oil rings on the pistons was stucked and the car have been loosen compration. Also the pillow blocks of the con rods was in very bad situation. He told me that I am very lucky that I decided to open the engine at this stage.
The good news is only two. The pistons are forged (underneath is wrotten 86P) and the carr is a dizzyless model!!, and also he told me that wear of the engine shows that have less than 60.000 miles.
The only bad is all the dirty from the two reasons that I mention.
Here is the pictures.
Do you know if it is visible the problem on the porous head?