So I have a 2007 street bob that I just rescently bought. After riding it for a few weeks i've decided that I want it faster. Current setup was done by the harley dealership when the bike was new. 103" engin, just pistons and cylinders the rest of the engin is completely stock. Stage one kit and download, vance hines big radius pipes. I bought the bike 3 weeks ago with 1067miles and it now has 2000miles. I am an extreem hp junkie and the rest of my toys all have had motor upgrades, NO2 excetera. I think for now I can be happy with hp and toque around 110. What is the best/most cost effective way to get to that #. Can it be done without head work or not. I never ride 2 up and my bike is fairly light. I dont need all that low end torque like a bagger would but I dont want a dog out of the hole either. The bike will be drag raced semi regularly. Also I will not increase the compression ratio as later I may go supercharger or turbocharger.

 

You should to head work AND cams to match the head work.

a 103 with around 190 ccp and good cams can scratch 120 lbs of torque.

frankly, if you REALLY are a HP junky you will always be thinking about it.

Buy some heads of Ebay, sent them out and swap them on.

I love turbo charging, i have had 3 cars with forced induction, but frankly that stuff dont belong on a HD.

PS, the cams i have in my sig, have been know to support up to 130 lbs of torque in a 107 ci. just a thought.

 

your never going to hit 110 hp/110tq without headwork & stock compresion (without NOS,turbo or blower).get your heads done,go to 10.5-1 with S&S .625 cams,you`ll be there and more,no prob

 

i have to find out what com ratio i am at. i was told by the dealer that did the 103 kit that flat top screamin eagle pistons were put in. he has all the bills for the work done but i have not picked them up yet. anybody know what compression flat tops yeild on an otherwise stock 07 tc96 with103 jugs

 

With a 103", it is not all that difficult to witness high teens hp and torque, with heads that'll move 285 cfm @ 28", 11.0 cr and Bob Wood TW-9B cam. A HPI T/body(55mm) would be in order as well.
On the other side of the fence, a 117" (Axtell 4 1/8" cylinders on your 4 3/8" stroke crank). along with the same set-up, 130/130 is fairly common.
One fellow forum member has seen 138/140 in his 117", with the Wood 9F cam.
Lastly, a 124" is only about 350.00 more than a 117"er.
Scott