Ok so now I'm on the hunt to upgrade to a 107, not looking for anything wild but looking for a mild setup. I already have the S&S 551 cams installed so my next Question is will the cams I have, work with a 107 or does anyone have this setup and happy with it?

Next Question, which brand of 107 is king out there, should I get heads or will the stock head work fine.

Thanks for any input

 

Looking forward to answers here.

Attached is a dyno sheet comparing a 103 to a 107 with heads. Both have the 551 cam installed.

 

I have the S&S 106" bolt in kit with the 89cc SuperStock heads and the 551 Cams, 58mm Throttle Hog with SE Injectors. It's a great set up, mild is what I call it for sure, but I'm in search of even more power, so I'm changing cams. The next step to go without losing bottom end power is the MR103 from S&S.
so who has the best kit? I like S&S. they have been around for decades. They are reliable. Make people can do head work to produce more power, but S&S is tried and true.

Hey 2013 FLHTK, what heads are you running and how do you like your suspension? I'm about to do my suspension next.

 

I have a set of mr103s. Cams only with 9000 miles. I built a 124 and have no need for them. Make an offer via private message of interested.

 

Send me a PM. Don't want the OP to get off topic.

 

I will buy the 103" dyno in #2 but having a tough time believing the 107" dyno; 130TQ is 1.2 and change per cubic inch which can be achieved but without knowing more about the build configuration and the dyno, not sure I believe it.

I would have second thoughts about running 551 cams in a 107" motor. Even with a .045" head gasket corrected CR is up about 9.8 and CCP approaching 210psi; pushing the envelope for me but, that's just me and I would have to hear from someone running that configuration before pulling the trigger. I understand wanting to keep the cams but a cam change and head work might be the best move with the additional displacement.

You did not mention fuel management in your OP. If you have not installed a fuel management system and had the current build properly tuned, you might invest in a tuner and proper tune. You might find that by optimizing the current configuration, the added performance might allow you to forego the displacement upgrade for the immediate future. Even with a good fuel management system, I would suspect the 551 cams in a 107" configuration to be a tuning challenge.

JMHO.

 

Djl, I always like to see those miracle dyno sheets. Far too many overachievers out there it seems.

 

Yeah 130 lbs is hard to believe... Remember TARGET64"s 107 build.. That bike sounded nasty and I believe he hit 129/127,IIRC... But it was a pumped motor with a good deal of machining....

And yes djl, 1.2 is not achievable without good head work...

 

Me thinks that the 551 is a bit short for a 107".
Minimum compression on those, even with a .040" head gasket comes in at 10.0.
Puts the ccp up there at 210 plus.......you ain't gonna like that.
Scott

 

Most all of these cams come with the EZ Start design and therefore the CCP shouldn't be a problem