Which cam?
Outstanding HDF Member
Joined: Sep 2005
Posts: 2,148
Likes: 2
From: Tulsa, OK
Thats not the case, at least in my experience. I run the 255's and find that they make good power right on up to 5000 rpm. It would be nice to do a dyno run or two to see where they do drop off. But for now the autotune is doing its job.
Banned
Joined: Sep 2009
Posts: 7,580
Likes: 7
From: The Internet (& Dyer, Indiana)
It is a great cruising cam though. I came close to installing one myself.
.
Road Captain
Joined: Jul 2008
Posts: 512
Likes: 2
From: Marlton NJ
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider
Verdad Gallardo
Extreme HDF Member
Joined: Sep 2005
Posts: 11,615
Likes: 50
From: Baton Rouge, LA
This is true. The 255's peak at about 5k and make more HP than stock, maybe +5%. Their forte is in the low-end and midrange, of course, and if you want to build a dyno-challenge champ you won't get it with these cams--but that's not their design.
Extreme HDF Member
Joined: Sep 2005
Posts: 11,615
Likes: 50
From: Baton Rouge, LA
I guess this depends on your definition of "falling-off," but I've seen quite a few charts on 255's, both in TC96's and 103's, and every one of those has peaked at about 5k. After that HP begins gradually decreasing, which is similar to stock except the 255's in a TC96 produce about 5% more peak HP than a stock motor.