Thanks, Tech, you just made me run out to the garage and get out the good old burrette (or whatever the spelling of that thing may be) again
They're 160cc runners.
I got some 1 5/8" headers for the baby once it's reassembled. Would they help torque or should I go larger/smaller? What size exhaust piping would you say?
Thanks again!

I'll check the flatness of block and heads tomorrow, here in Germany it's already quite late in the day and I've already spent hours taking everything apart...