need more 720 gas HP

[720deere puller]

Needing contact info or any info on increasing hp on a stock 720 gas, pulling in 8500 & 9500lb. classes. Any help would be greatly appreciated.
 

[Josh Blackburn]

How much power are you looking for. I have a real nice set of lp pistons. They will be a quick and easy 10 hp they Look brand new or can do something more. 9892775366
 

[buickanddeere]

Higher compression. Re-ground camshaft. Port and manifold matching. Blend and smooth casting flash and sharp edges from the inside of the ports. A professional 5 angle valve job by a race engine shop, not a valve job by Bubba . Dry air cleaner element . Propane intake and exhaust manifolds.
Will make an easy 75HP at pto rpm.
 

[Dblair]

there was a post on this forum a couple years ago where a guy said he went to 77 hp with the addition of diesel pistons . take it for what it's worth could just be hear say . that's a 22 hp jump from stock .
 

[buickanddeere]

Maybe onto something? The gas and diesel used the same 6-3/8 inch stroke. The diesel bore is 125 thou larger at 6-1/8".
Must have required some high octane fuel, couldn't even guess the compression ratio.
720AF 4.9 to 1, 720gas 6.14 to 1 and 720LP 7.94 to 1.
Even the LP pistons are an 29% ratio increase over the gas.
 

[Lee DePew]

how big of a stroker crankshaft would fit in a 720 gas was a propane tractor converted
 

[jd b puller]

Lee, as far as I know it's the same as a G/70 as far as how much you CAN stroke it.

Stroke + journal = 13.375" I'm sure someone has gone bigger, that's worked for me.
 

[Lee DePew]

thank you for the info greatly appreciated!!!!!