This should be a good comparison being both bikes are so similar, First off my bike is a 2011 street glide se 255 cams thunder header, big sucker breather. tuned with sest. my buddy's bike is set up exactly the same but se 254 cams> both bike were tuned at the same hd shop even by the the same mechanic, my bike with the 255 cams made 89hp with 111lbs of torque, The 254 bike made 87hp with 107lbs of torque. The only major difference in this comparison is my bike was done one year ago and his just last weak. Now the fun part, we got together to go on a ride a couple of days ago and compare notes, When I rode the 254 bike I must say I had to agree with what he had been telling me on the phone, Not much bottom end or mid range especially when compared to my 255 bike. We both expected my bike to walk off and hide from his. We rode out into the country where there used to be a quarter mile marked out for the kids to drag race and did a couple of rolling starts, boy were we surprised to find the 254 bike could pull mine by about a bike length 2nd gear to about 70mph. The 254 cams are definitely fast as my bike is no toad. I guess the next test will be when the weather warms up and we heat to the mountains with the wifes and loaded with gear.

 

Nice. Well that proves that a dyno chart doesn't always reflect real world riding.
Now this is a great post for the inevitable which cam thread,if a person tries out the search function.
Thanks for the info.

 

Thats interesting any thing seen from Hd showed them close.I had an 09 ultra 103 stage II 255's traded for an an 11 Limited put the 254's in it and I couldn't tell the difference from the seat.

 

My 255 bike pulls super hard to 4000 rpms then just signs off where the 254 bike does not start to pull till about 3500, Just nothing on the bottom end.

 

Thats odd My 254's hit over 100tq.between 26 and 2700

 

Rich, in addition to your heads, I'd also suspect you have a bump in compression over stock.

Mark

 

Per the H-D Screaming Eagle Catalog: "this cam provides great low-end torque along with good midrange. A good “all-around” cam, the Se-254e is a good match for a Dyna, Softail or light touring bike - road King®, Street Glide® or road Glide® Custom - when the aggressive rider desires a little more top-end horsepower. In a 0-60 sprint or 1/4 mile drag race, the SE-254e-equipped model would pull ahead of an identical model with a SE-255 cam"


mikebaby

 

Yeh a little my heads are supposed to be at 85cc which is what the factory are supposed to be at and I used .030 cometic headgasket when put the heads on. I'm think I might of been right at 10.0:1.never really checked for sure.

 

Shouldn't be surprising at all. In the parts catalog it clearly states that the 254 will pull the 255 in the qtr.

 

Like I mentioned earlier had both in 103's simlilar heads and I couldnt feel really any diff.maybe a tad more in comp.with the 254's but not much but the 255's just had a HD map never tuned.LOL I had a shovel head before that didn't know any better tell I started learnin more on here.