Decided to pull the trigger and trade my Road King for 2013 Street Glide and purchasing the 120R motor. Going with the Rivera pro clutch, D&D Boarzilla and the SE heavy breather and the SE Pro tuner. Now the question is I am thinking about installing the Hurricane heads with SE rolling rockers and the 64MM throttle body. Has anyone done this combo with 10.5:1 pistons? If so what were the pros and cons? Some suggest the 58MM with the MVA provided heads, others say keep the MVA heads and get the 64MM. I do plan on a dyno after all is said and done. I have heard the pros about a different cam and the 12:1 pistons and maybe a new transmission but I am not $$$ ready at this time although I may explore that option down the road in a few years.

 

Wow! Doing that to a 2013??

 

Was riding with a guy here last week that has the 120R in his street glide, all I can say is wow!!

 

Yes absolutely, so when it come time to sell this bike I can put the 103 engine on with little or next to no miles on it or if I blow up the 120R I have backup! Now if some people can assist me with my questions it would be greatly appreciated!

 

There are not many threads on the 120R, so use Search to read through them. Hurricane heads have been mentioned, but not often. Sounds like an interesting project!

 

Not much for chit chat? Funny stuff.

 

If you're leaving the stock cam in it, the best mod you can make is more compression. Bigger heads will kill any bottom end, same as a bigger intake if you do not have the compression to compliment it..

Most use thinner head and base gaskets to bump the compression.
I actually took the 266 cams out and went with smaller 260 cams since I plan to put a lot of miles on it and just do not want that much lift.

I am going to install the thinner Cometic head gaskets since I am all about low end torque.

 

Mind sharing who done the work and what was the price-tag? Any dyno-numers?

 

Your SG sounds like a beast. Good luck with the mods!

 

the hurricane heads need compression and a bigger cam. I have seen some people get great results with more compression and a cam change to get more torque down low. What kind of power are you looking for and what type of riding do you do? I have about 20000 miles on mine and just did a compression test. It was still perfect.