How do you know it actually touched the head? Would you get a mark if it was just very close?
24 thou is too tight
Personally I wouldnt go below 35 thou
Rods and pistons stretch, crank and gudgeon pins deflect.....it all adds up
Also to tight a squish can create det
If that's the case, Jon you may still have problems.
What problems Matt? The same stuff moriarty covered?