Look into king of cubes ( hyperformance) or axtell kits. They are some of if not best in USA. Go way beyond 117. Here is a link to axtell

http://www.axtellsales.com/Twin-Cam-120R/

Or pm Randy on here ( kingofcubes) as his site has doesn't break down his kits or prices.

 

Going from a 103" to a 107" does not get you a ton of extra hp/tq for sure but that is where headwork comes in. If you want a big boost in power then you need to get headwork done and if you are going to do that then a big bore is an easy add on that helps you add a little displacement and better pistons along with some more ability to get your compression set right.

If you were to skip the big bore then you might have to worry about the stock piston valve reliefs not being big enough to handle bigger cams, something that aftermarket pistons do a much better job of.

Bottom line, I think you will be happy with a nice 107" with headwork, but if you have plenty of $$$ then a 117" would be a blast but a fairly big increase in cost too.

 

i don't have a particular number in mind per se, but i think anything over 115/115 would most likely suit me for quite some time. i love the feel of a strong pull....like hold on tight or be sitting on the pavement, so the more tq the merrier! there was a nice change from stage 1 to adding the 222 cams, but i just still want more. i wouldn't be opposed to spending as much as 4000 if it was a vast change. if i could get what im looking for without splitting the cases and spending half that, then i would look at those options. i just don't want to do 107, then be slightly disappointed and wish i would have done 117. i know for a fact i could add the 107 myself, but i have no experience nor the tools to split and bore cases. i guess at the end of the day i'm wondering with some great headwork, how strong could a 107 go? part of me just feels like i won't see that much difference with 4ci difference.

 

If you are willing to go all in on the headwork($1000+), get bigger cams, 107" BB, and raise your compression up to about 10.5:1 to 10.8:1, and good 2 into 1 pipes(not sure what you have) then I think 115/115 is a slam dunk.

I had a local indy split/reseal my cases and install the Timken bearing on the left side and package my crank for Darkhorse for $500 plus about $40 shipping.

Your cylinders will be bored out by any of a multitude of shops - not something to be done at home.

 

Mine was on a 107. Screamin eagle 50 bored out with injectors.to 52mm. Awsome tourque Hpi comes WITHOUT injectors so add 150-200$ on top of your hpi purchase. Unless u can find it used. But if you go 117 124. You are prob going to want 55. 57. 62mm ect....

 

headwork around 1000 isn't out of the question, i already succeded to the idea of going with a larger cam, and 10.5-10.8 seems to be the sweet spot in compression these days. as far as pipes, i have the bassani rr b1 so i think im set there. to think that 107 will get me where i want to be with proper headwork gets me leaning that way. thanks for the extra info. very much appreciated.