May be a little more extensive than what he's wanting to do, but gives an idea along with your original post of the 570/575 capabilities. They definitely love low end! Stock cylinders bored to 113, KB pistons (10.2 comp), HPI 58mm, Marren 5.0 injectors, WFO Larry heads, Fullsac DX, Kuryakyn Crusher exhaust, handful of other goodies.

 

No gear drive needed,and the S&S 510 is an old design for 88/95 twin cams. Andrews 48 would be a better choice,and a good price.

 

The 551's are the upgrade for the 103 from the 510's. I have had them they are awesome. Great low RPM/high torque cam. Perfect for under 3000k he will not be disappointed, and I concur, no need for gear drive. Chains do the trick. Go for the easy start if you have a Power Vision, and make sure to run new lifters regardless of whatever cam you run.

 

I have 510's in my 13 limited. As previously mentioned, under 3,000, not that impressive but if you decide you want to push it, hang on!!! I have mixed emotions about them. If you live under 3,000 rpm, why even put in a cam? But those times I really want to go, they haul ***. It's the heaviest bike I have ever had but with the 510's it's also the fastest. Easily hit's a 100mph and quickly.

As also mentioned, gears require a very straight crankshaft. My indy recently rebuilt my Road King. He was talking gear cams but when he checked the cam plate and saw the wear left on the tensioners, he stuck with the original chains even though he trued the crank. He said that the gears are also noisy.

When he rebuilt the Road King at 113,000 miles and after discussing the cams he had put in the limited, he recommended SE204's for this build. I wasn't looking for anything crazy, I wanted dependability and longevity but I also wanted something that would work with my riding style in the lower RPM's. The 204's are great for me in the Road King. No tach but they come on much sooner and pull hard. Great torque.

I know neither of my cams are the latest and greatest but they gave me the little more I was looking for but should still be dependable.

There are a lot of choices in cams. If the indy is reputable and is also doing the tune, your friend just needs to talk in detail about his riding style and what he's looking for in a cam. The indy should be able to make a very good recommendation and tune the bike to fit him as a rider.

 

Edward,, please post your Dyno Sheets for Both of your Bikes..

 

I'm sorry I don't have one for the Limited with the S&S 510's. It runs a little smoother than the Road King with SE204's and has more top end speed. Torque comes up around 3,000 and you really feel over 3,500.

My indy's printer was jacked up when he tuned it but here's a crappy pic of his monitor with the tune in progress on my Road King with the 204's. Sorry I cut off the RPM line at the bottom. I think he said it was a 4th gear pull. The tune has changed a little bit since this snap shot ( it was too lean ) but 107 ft lbs on a basically stock 103 is pretty sweet. Keep in mind I told him I wanted fuel mileage and not all out power. It is my commuter bike after all. I'm running Rinehart True Duals that are 8 years old with over 100,000 miles on them. A good performance pipe and tuned for power, I'm sure the torque number and HP would have been higher. Added bonus on the 204's is that it has a great lope at idle. As close to the carbed potatoe potatoe sound of old bikes as I have heard on a fuel injected bike.

The indy doing the work is going to be the biggest influence on what you get in the end. Do you want torque, HP, fast of the line, more top end, fuel mileage, peak numbers, dependability, ride two up or solo? He has to know what you want and then he can pick the right combination of cam and tune to get you there. He also has to be good with the tuner. The perfect cam wont do you any good if the guy doesn't know how to tune it right.