I run a 2017 FLHRU with SE Stage 4 Kit and I'm thinking about upgrading my valve springs. I run mostly on the backroads with some highway at 3000 - 4500 rpms with an occasional 5200 rpm. Any help would be apricated.

 

All I can say is I had an AV&V spring break in my 2012 CVO 110.

 

What lift cam?

 

Steve Cole at Mastertune.net has high lift valve springs with lower pressures than most suppliers are using. With the lighter valves in four valve heads he noted that most after market springs were stronger than what is needed. This strains the whole valve train.TTS M8 Performance Valve Springs

These Milwaukee-Eight Beehive shaped valve springs are made to withstand the High Performance needs of higher lift camshafts like the TTS 200 and TTS 250 cam profiles. Manufactured from quality chrome silicon based wire that is shaped, heat treated and shot-peened to the highest standards. The unique shaped of the wire allows us to provide a high quality high lift spring in a smaller package size to properly control valve motion, without the need of excessive pressure which robs performance and decreases durability.

Set of 8 valve springs.
2000311All '17 - '22 Harley-Davidson Milwaukee-Eight Models

These springs are drop in replacements for the stock M8 heads with no modifications necessary.

When installed at stock spring height (1.535") they will handle .585" valve lift and when installed at 1.550" they will handle .600" Valve lift.
$249.95

 

Thanks for the info and I'll give him a shout.

 

I run s&s no issues since i have been using them.

 

this might help Information from george

 

Better call 90% of the head porters and OEMs and let them know

 

There have been a few of the high lift AVnV beehives that have broken. As I understand it, they were running with too much preload. It's possible that when setup the valve stem was too short.

I've run low lift AVnV beehives in 06 heads maybe 60000 miles. I'm running high lift ones in my 131 but only about 5000 miles. I've put 70000 miles on AVnV heavy dual springs (free) with 0.550-0.590 cams (member of the cam of the month club)

 

Just got info back from hammer, they told me the same thing, with the cam Im getting new stock springs would be fine and like above, heaver will put a strain. They did say not necessary though that upgrade lifters will quiet thing down