Hi ,
I think I would be paying attention to the ring land clearance on that piston . Unless it is a shadow it looks like there is a lot of land to ring clearance .
A good auto machine shop can machine the grooves and supply the correct spacers and rings .
Good luck and a happy new year ,
Justold
For what it is worth , I have two machines a walking foot consew 244 and an much much older singer slipper foot machine . The slipper foot machine was almost uncontrollable as it has a very heavy flywheel type clutch , what I did was take the clutch apart and apply vaseline to the clutch faces then wipe them off . the 244 I did about 30 years ago and have had 0 problems , now you can engage them slow and easy same for the singer .
Just remember too much cfm engine goes slower! Size cfm under what you think you need . CFM = ci x rpm /3456 = CFM @ 100% unless highly modified you want to be about 80% .
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