I'm currently in the middle of swapping motors in my 07 fxdb. I removed the rockers so I could powdercoat the rocker covers and realized last night that the breather assemblies are different between the 2 motors. In my old motor are the thicker cast breathers, and in the newer motor (I believe a 2012 electra glide) are these thinner stamped ones. I assume that the stamped style are an upgrade and I should continue to use them in the new motor, however, I have a couple questions.
1. I'm aware the bolts are shorter for these so I will be sure to use the existing shorter bolts for it.
2. It looks like the gaskets I have don't match with the newer style breather, and on Ronnies there isn't even a part number for the gaskets for it. Do I just need to buy whole new breather assemblies?

 

When you buy the assemblies, they come with all the gaskets, and new bolts. It's a complete kit. The newer stamped ones are, indeed, an update.

Cheers!

 

You probably already know this, but DO NOT, repeat DO NOT use the bolts from the cast version when upgrading to the stamped version.

 

I use the old cast ones.. Get the viton flapper from HD..

 

No one makes the better than HD OEM..👍