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[QUOTE="jmics19067, post: 609475, member: 27963"]
Don't run the engine  until you check this out.  
 If the cylinder  has been  lined,  decked, and overbored  take the head off.  rotate the crank until you have the piston at top dead center. Visualize  that I am concerned about the edges  of your overbored piston  sticking up  out of the decked cylinder  and hitting the edges of the un modified  head. From what I understand  you want .040" clearance between the edges of the piston  to the head. Depending on the combustion shape, power characteristics  you want , etc etc that .040" should be a certain percentage of the piston area  starting from the outside edge.  Can't help you too much with deciphering that but,  if there is no clearance it is definately wrong and  sounds like it would be very expensive to run

Also  if  you have an overbore piston  your exhaust valves  might be scraping  the side  of  the piston.  rotate the crank so the piston is bottom  and make sure they aren't  scraped up  where they may protrude into the the area the piston  will  be.   also take off your pipe  and look thru the exhaust port with a flashlight  and slowly rotate the crank  making sure  that the sides of the piston  or the ring  doesn't have a scrape mark on it that would match the powervalve.

these things are probably worst case scenerios  but  will be very expensive to repair  if  you try and run the engine  especially if you run it hard.  It might  cost a bit to straighten it out  but a heck of a lot less  than what can happen  if what I think  is your problem.

P.S.

Eric   is  a rare example   of a long forgotten work ethic in my opinion. Any body  who takes  his  time to explain what  he thinks and what he can do for you  with honesty and integrety is worth every penny  he  charges. Mind you  he  can only  go  by what you say on the phone  but he listens  and  gives it his best shot from your information.
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