I have a 05 TC 88 and I just opened the cam chast to replace my cams to the the andrews tw 21's and I'm thinking about getting the zippers shim for a little more oil up to the heads / rockers .

 

Or you can get a Baisley spring and install it to get more oil pressure and oil up to the heads. I believe the one you would want would be the LMR-002. Try www.baisley.com to research

 

And I'm still wondering "why?" Harleys don't require pressure, they require flow. Aside from circulating oil more quickly to achieve cooling it quicker, or perhaps in really high performance motors an increase in sump pick up I can't see a reason for it.

My '00 Road Glide still runs a totally stock original style oil pump and cam plate and has never had an oil issue in 140,000 miles on a Stage II build. So what benefit would it offer me (or you?)