Quote: I'll open acan of worms here. Using a 5/8 end mill set so that it just takes .005 off the orginal pushrod hole on the port side, bore them out. die gind the pushrod pinch out of the port. Press in a 5/8 od brass tube cut to lenght with some locktight sleeve retainer. You just picked uo at least 15 cfm of air and will have push rod clearnce galore. Exhaust just bore them out.
