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[Jasbel]

Hi

I'm looking for a little information and insite regarding Head Work etc

I have A 2015 CVO street glide all standard accept for V&H Power Duals with Monster Rounds and a K&N Filter, I may keep the Se 255 cams.

Is there any reason not to get some street porting while using the 255 cams, I've been reading about people changing to lighter beehive springs valve guides etc due to the standard springs been to heavy

Is it ok or safe to run the standard 110" CVO heads springs  or do I really need to do these upgrades ??

I hope I'm making some sense

[Ridgerunr]

Some have no issues with the way Harley's come, others have nightmares. Always been that way. There are several cams that will still give you the low grunt of the 255's and respond very well in the upper rpm ranges with headwork. CR 575 comes to mind. That way you can address the springs and guides, sleep well.

[HD Street Performance]

If that cam stays consider only a "blueprint" with new guides and springs. I use a new springs now because at the installed height the AV&V springs I was using were still high on the seat with pressure. Contrary to the information that floats around the internet the stock springs don't have excessive seat pressure but do have a higher spring rate than the .600 and .650 beehives from AV&V. That said I am not a fan of the heavy dual with damper design. Less spring pressure, within reason with a lighter spring package, extends lifter life and lowers valve train noise.

[prodrag1320]

we also replace springs on the 110 heads (.600 or .650 lift beehives),I also agree on guide replacement.just decent raduised seat work & mild porting is fine if your keeping the 255`s

[Jasbel]

Hello


Thank you everyone I really appreciate the education & advise

Please forgive while ill  try to absorb all this information

I see I may have2 options, pretty much leave it alone accept maybe upgrade to quality lifters something like S&S Premiums lifters other than that get a good tune and go and ride

Or do what prodrag suggest replace on the 110" heads with .600 or .650 lift beehive springs + guide replacement and a mild porting. would it also be advisable to cc/surface/equalize the combustion chamber volumes, And bump compression slightly ?

What sort of gains would I obtain with a 255 cams please

[Scott7d]

The experts can correct me if I'm wrong, but from what I understand and what I've seen, you're going to be limited to right around 100HP/120TQ, maybe a little more with the 255's regardless of the other work you do. It just seems like that is where those cams top out. That is totally fine depending on your goals. The other work however can offer benefits other than power, which a couple of the others have described. Quieter operation, longevity, etc.

I went with the Cycle-Rama 575's and gained everywhere across the board, but also had a bump in compression to about 10.2 to 1. It is a pretty common bolt it cam for 103's and 110's both. For what it's designed for, I think the 255 gets the job done. Especially with solid stage 1 components and a good tune. You may be covered there.

By the looks of your post, it seems like you're more into a solid running, dependable bike rather than power chasing. I can respect that!

[HD Street Performance]

Makes sense.
Cam change with a small compression bump then some mild porting can be leveraged.

[prodrag1320]

255`s wouldn't be my first (or second,third or forth) choice.we`ve used S&S .583 & 570 with very good results on low end torque 110 builds (set at 9.8-1 for the 583,10.0-1 for the 570) the 583 will hit lower to about 4500 while the 570 go 2000-5000

[HD Street Performance]

I just move up in duration and skip all of that. I have no particular like for highly exhaust biased grinds either. The Tman 590 is a case and point that never disappoints in a 110 based motor even when cheated a little on compression.

[snowrider13]

I did some changes on mine only because I HAD to tear into it. I too liked the 255 cams. I would not open it up unless problems occur. My biggest gain so far has come from a good tuner. Completely different bike. Smoother, cooler, better mileage.

[Jasbel]

Hi

Once again i just to  say a big thank you to everyone for there input & advise as I've leaned a lot during this discussion

I was thinking to keep the SE 255 cams, but I'm starting to think the CR 575 cams might be a far better choice of cams for my set up.

I will get the Springs & guides done, and while the heads are off I might as well get a valve job, cc/surface/equalize the combustion chamber volumes.

Just one more question please, what would be the best set compression ratio for the CR 575 for my application please

Cheers Darren 🇦🇺🇦🇺👍👌👍👌🇦🇺🇦🇺

[Jasbel]

.

[prodrag1320]

we set them @ 10.0-1

[LC110]

 10:2:1 works great with standard fuels. I ran that cam for a couple years, you will enjoy the extra power and the engine will run cooler than with the 255 cams.

[Scott7d]

I run the CR 575s at 10.2 to 1. From what I understand that's about as far as you want to go with them.