relief

Hi there, Does every ULH zylinder have relief and Ul do not? Or 13 fin zylinder does and 11 fin not? Thank's in advance Joe

I have several 13 fin cyls. the 74s arent relieved and one of the 80s is. I heard that some of the 80s got factory relief. If the 74s got bored out, you had to do it yourself. Honest

I have several 13 fin cyls. the 74s arent relieved and one of the 80s is. I heard that some of the 80s got factory relief. If the 74s got bored out, you had to do it yourself. Honest

Thank you for replay. I have one set 13 fin 80s for my 37 ULH, they have reief. I don´t know factory or not. All my 11 fin zylinder don´t have relief but i belive 11 Fin zylinder are only 74s.
Once again do 80s have factory relief and 74s not?
Best regards Joe

13 fin came in both 74 and 80. some of the 80s were relieved. I don't think any factory 74s were relieved, but not certain because they could be bored to 80 anytime. The 11 fin I believe started out as 74s, then grew to 80s with overboring. But that is mere conjecture on my part. Any experts out there?