I have an 2011 Street Glide: Woods 777, SESPT, SE Heavy Breather, Rhinehart Duals. Had it tuned and Dyno'd with cam install. Dyno sheet attached. 100.7Hp and 117Tq. Runs very well. My question is how much more "bang" for my buck will I get to do headwork and/or bump compression a bit?

 

If your not going to do head work you should have used 555's. The 777's like the head work and compression set at 10.5 +.

 

Check out fuel moto's website. Thet have plenty of dyno sheets with specs of work done. Maybe that will help u out. Im not an engine builder other then workin on and buildin a few v8's and what seems to be the big key that everyone agrees on to makin good power is all in the heads. Better airflow in better flow out will make more power. Bumpin the compression will only make it even more fun. Depending how much you want to bump the compression id say compression releases would be recommended to save some strain on the starter. Hope that helps a little maybe someone with better experience will chime in

 

If you're happy with the way your bike runs, leave it alone. If you're chasing numbers on paper, heads and compression will raise those numbers a bit.

 

I'm in the process of building a 107 with 555 cams, Ported heads with 1.9 intake and 1.610 exhaust. My indie(J&B Performance) that's getting the head work done said the machine shop asked if he could install the 1.610 exhaust valve instead of using the stock one because he could cut better flowing angles from increasing the size of the valve for only $35 more. Well that was a no brainer. By the looks of things you'd pick up at least 10 & 10 if head work was done and properly tuned.

 

Thanks, but 777's are already in so not much help with that. Before installing, had lengthy discussions with motor builder and Woods people. My thought process was cams now and head work later. Was told by both that the 777's would perform fine at stock compression (would even be better at higher compression) and the torque curve would be a little more to what i was looking for. I got a lot more power from the work than I thought i would. I've looked at a lot of dyno sheets on the site and it seems like my power profile is pretty solid, so I am now questioning whether the money for headwork is worth the extra boost in power.

 

Yep, that's the issue right now. Not chasing paper numbers per se, but original idea was cams that would do well with the head work I was going to do later. Now after the jump in performance, wondering how much more I'm really going to get. Looking at other dyno sheets is the only way to kind of guesstimate and it seems that I'm pretty close to what others are getting with head work. (given slight variance in dyno #s)

 

The issue is it sounds like your doing your build in stages, like many of us do.

But if you do your heads for a 103 w/ cams set up and then you want to go big bore later your heads will be off a little. If your planning to do heads (yes do the heads) I would do them at the same time you plan on doing a big bore ie. 106 or 107 jugs. If your just doing what you have and want to do heads and compression then yes you will see a little gain. But if you already have the heads off getting worked on anyways why not pull the jugs and pistons?

 

Those are great numbers without headwork. I been kicking this same question around. I am happy enough with my budget 103 build (Andrews 54s, 109tq/99hp) but want to get the rocker boxes and lifter blocks power coated so thinking of headwork as long as I got it apart. I think you will get more with a proper match on your 777s than me and my 54s. Ya ought to pick up at least 10/10 on peaks but the real gains will be on the bottom with compression and top with flow. So power will carry on both ends for a longer and smoother curve. It least that's what I'm hoping will happen as mine is coming apart this week for headwork.

 

Makes sense on the comp and flow. Who is doing your headwork?