I have a question about what is the biggest engine- aftermarket or H/D- that will fit in a pre-Milwaukee Eight Softail chassis? I have a Screaming Eagle 117 in my '17 Slim S and am curious what are my options if I want to go bigger which chances are I will want to. I can't seem to find anywhere that makes one for my application. Just looking for possibilities. Thanks.

 

Try looking at sscyle.com,they have a big engine program.

 

Just saw and add for 131 cid for a softail.