would it hurt to put one in all 8 holes.

 

I've wondered this as well. Why just do one side? Is there a reason for this?

2010 Limited with some stuff

 

It wouldn't help. Only the two bolts on each cylinder on the air cleaner side of the support plates engage with the notches in the shafts. The two bolts on the primary side are located closer together & miss the shafts completely.

 

There aren't any notches on the far side of the rocker shafts for the inserts to lock into might be another way of saying it.

 

Makes sense. Thanks for the reply.

2010 Limited with some stuff

 

I just finished the install on my bike. It's raining here in Boise so I'm not going for a ride. I did start the bike and let it warm up. It makes far less upper engine noise than previously. I expect it will be quiet throughout the RPM range now. Thanks for a product that does what it says and at an affordable price.

 

What year models do these fit? Mine is a 2004 flhtc

 

All year twin cam engines, yours included.

 

That's great to hear!

Thanks for taking the time to share your results

 

Ok thanks, mine is pretty friggin noisey, if it will quiet mine it will quiet any of them!