thanks 007 .. I found the thread, My problem is the bottom of the
p/c is about 1mm to big for the new cylinder head hole in the combustion area , Maybe I should take the bosch drill to the new head???. NOT, 120 each for p/c is to much, I only paid 200 for the new head, and 200 for the SD with a steamy exhaust,
I guess i will take it down to the machine shop to have the combustion hole enlarged to fit the old pc,

thanks
Dave