D Bull gears

Hey mEL I’m going to be running a DO for pulling I have 4
inch pistons at the top of the sleeves. 5505 head will be used
I’m wondering what would be the better bull gears 38 or 31?
I believe it has 31 in it. I will be using 16.9 or 18.4 26 inch tires
this tractor is just getting started for pulling I haven’t pulled it
yet thanks for any info I can use either 5576 or 5505 head I
checked both chambers 5505 has 190cc and 5576 has 240cc
right now 5576 head is on tractor I’m will be cleaning up
intake and head with mild port work most everything else will
be stock for now thanks ol case mike
 
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