CHIPHEAD - thanks for the info. I've decided to go with the Patricks M4F due to cost for this particular motor. You must have meant 210 not 221 degrees @ 0.050" for the Clifford 260M (at least that's what it is now). The M4F is only slightly milder and should help with low end torque.
Additionally I will be putting a single exhaust on it rather than duals like you were running which should help. I would think dual 2" would be too much for that small engine with a carb.
Best Regards,
