If you do pull the plugs "every few hours", please do it right with the torque set for 30 ft/lbs if you have heli-coils and not the bronze inserts. Always use new copper gaskets and not reheated ones as they are often warped and distorted. Do use TCP if you can, change the oil no later than 25 hours and 120 days. Avoid long ground runs and compare your baffles to an O-200
engine as they have better ones than the original coupe ones. Check the soft baffling for leakage at the back. How is your oil pressure after a twenty minute flight at normal cruise. Check the carburetor for jet size and throat diameter perhaps the wrong one was installed and the engine is running on the lean side. Recheck the timing isn't advanced too far from normal. Lastly avoid "jerking" the power off and landing with no power and long glides at low power settings leading to "shock cooling" perhaps. good luck/tom
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