Ironhorse, I'd really love to see what the dyno sheet says & your opinion when you get the bike back. I emailed S&S tech dept - he said he thought my choice should be the 510's since i wouldn't need to change the springs (huh?) i mentioned I shouldn't need to & he replied the 583's should work well in the rpm range I'm looking for (1500-5000). Looking at the cam specs, I'm surprised S&S lists this as a cam for softftails/dynas. I think I'm ready to pull the trigger on a set. Did you do gears, hydro conversion or stay with stock chains?
thanks,
Paul
Paul,
Here's the dyno sheet. I know I could have gotten bigger numbers with a 107 kit, larger throttle body, and head work. However my main focus with this build was a well mannered engine that would go another trouble free 80k miles. Not having had any other cams in there other than the stock SE 253s, I can't give you a seat of the pants comparison to 551s, 575 or anything else.
What I can tell you is that the engine is smooth. I'm not too sure if the smoothness is the balanced, welded, and pinned crankshaft, the cams, the 2-1 exhaust, dyno tune, or new front motor mount. It's probably the result of all of those as built by Jim. The power is right in the area where I ride. Cruising at 80mph in 5th gear at 3,000 rpms the engine runs smooth and effortlessly. Just a roll of the throttle will move me quickly enough. Is it a head snapping pull when I roll on the throttle,..no. But it's more than I need, or I should say it's what I need. I am still enamored with the smoothness. I do a lot of slow speed motor-cop cone work, so I didn't want an engine that was loping along at lower rpms.
I can't say enough of the work that HD-Dude did at Metal Dragon. I went in with high hopes, and have not been disappointed.
Hope this helps.
Mark