I see there are quite a few guys here with the 107 engine and I plan on doing the stage 2 this Winter after riding season ends. I've seen the 96, 103, and 110 on Harley's website, but no 107. Are you getting the 107 after doing headwork/boring, or where is this displacement coming from? If you've got a 107, could you please explain why you decided on going that route and what it cost you? Also, what is the HP/TQ difference you got with the 107 over the 103? If it's numbers are good and the price is comparable I'd definitely consider it.

 

107" is the largest bore you can go without boring your cases. You don't see on HD's website, because they don't make a kit for it. Aftermarket is the way to go- GMR Performance, Head Quarters, Hillside, etc all do 107" kits. The cost is comparable to a 103" kit, and makes more hp/tq (if set up correctly). If I was starting back at square 1, I'd definitely go with a 107" over 103."

 

Add NRHS.
They and maybe others use Axtell Cilinders and JE forged pistons.
Dan at NRHS fitted the rings and the pistons into the cylinder for me for just a little more.
Very pleased.

 

Yep, most of the builders have 107's available, and most will either bore or have Axtell or Millenium cylinders available. Downside of the 110 is you gotta split the cases to bore them to accept the larger cyls. If you are going that far, you might as well go to a 113 or 117. Same amount of labor and near identical in cost .

 

yep 107 Hillside bores your existing cylinders and supplies the correct piston and rings.
give Scotty a call. 315-495-6650
quality you can trust

 

sedelux, thanks

 

the difference in cost of a 103 vs 107 is minimal; the difference in performance especially on the TQ side is night and day.

 

Don't forget the one important upgrade whichever way you go. Get the crank reworked, otherwise it's like building a house on a cardboard foundation. I'm somewhat forced to do the crank as it's on it's last legs. Everbody has their own reasons for what engine they want or think they need. Early on I thought the 113 was where I was headed but since that my mind has changed. Decided on the 107 for these reasons. I have the cyls already, they are seasoned and good candidates for rebore and will be stable with heat. Headquarters will be doing the heads to wake them up. Decided against the timkin conversion since the max power that the 107 could make is well within the design of the improved SE straight roller. This way my cases won't need to leave my property since no case boring or timkin conversion is really needed. This statement will drive many engine builders nuts, because it's become the standard for most builds. This is a substantial cost savings to me by not doing needless work for my intended application. The other benifit to me is I can retain modern O ring sealing on the cyl bases with the 107. Try as I may, I can't stomach base gaskets. They work, but not for me.
Done right, the 107 well tuned with a good 2-1 Supertrap will deliver #s that are very impressive. That's my choice at the moment and reasons for doing so.
Ron

 

Very well put Ron. You make a good case for anyone doing a build to think it through properly before going to a shop and just handing over a fistfull of dollars.

 

Yeah I just finished my 107 build. I used axtell there stuff is really nice.