88 upgrade vs 96ci upgrade

[67wizard]

I have two friends one has a RK 88 ci upgraded to 95ci, the other 96ci upgraded to a 103. The 88 seem just about as strong as the 103 with cams. Is this correct or is something worng with the 103 upgrade?
Thanks for your in put.

 

[HOLY DIVER]

hmm.... this is intresting. i guess the only way to know for sure is to dyno before and after. i have a 88 with 21n cams and my bike runs very strong. i had kicked the idea around of installing a 95ci kit,mine is an 06 model and suposed to have better flowing heads so i thought a 95kit to go along with the heads,cams,etc.but after reading your post....not sure

 

[The4opps1]

My experience with performance upgrades is that you have to look at the package as a whole. That is, bumping an 88 to 95 will increase your displacement and more than likely add a few ponies, but the issue of whether that turns into neck snapping performance is another matter. A lot of times, just taking a stock motor and letting it breathe better (head work , cams and exhaust) can do more for performance than extra cubes. I recall a guy I knew as a teen who campaigned a '55 Chevy 150 at the local drag strip. He was as competitive, or sometimes even more competitive, as guys running big block motors. His power plant? A little 265 small block. But this baby had everything done to it that was legal in his class (D/Gas). The heads were put on a flow bench, the entire rotating assembly was balanced, the cam was specifically ground for his motor, I mean it just went on and on. The question, IMO, becomes just how much do you want to spend, and just how much horse power do you really need?

 

[67wizard]

I see after some looking and lots of looking the two are almost the same as for power. Checked the Harley book from a friend and compaired the two upgrades.