You have gotten a lot of great advice!
For what its worth, the first cub I bought was for stock pulling. First couple of pulls, I ran out of power and bogged down.
Had the head milled .040 and didn't run out of power after that. Motor was bone stock, nothing else done.
Your mileage may vary!
Randy
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2 original cub cadets 
1 100's
2 149's
1 73
1 2182
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