Originally Posted by mike tkach (Post 4519720)

you stated that you formed your opinion a long time ago on the scorpion rocker arm.would you please tell us what made your mind up on them.

Originally Posted by MILD THUNDER (Post 4519610)

Last year, when I was rocker arm shopping, the Crane Gold rockers, were MIA. Everywhere. Nobody had them in stock. Apparently, production on them stopped, and rumor was, they were being outsourced. I always liked the cranes, but obviosly, if you cant get them, then that does no good. I then began really liking the option of a steel rocker arm.

One of the things I've seen , on some aluminum rockers, including my old Crane Golds, was the Trunnions split in two. The Trunnions on the steel rockers, like the Comps, or Crowers, are massive in comparison. I chose to go with the new Comp Ultra XD magnum rockers, based on some info I had got on them. Basically, they were a new and improved design, that alot of technology went in to. Lifetime guarantee against breakage is a nice feature as well. They must feel pretty confident in them to offer that. Another option they offer on them, is an upgraded Trunnion, if you were to decide to run 1/2" diameter rocker studs, instead of 7/16.

We all know steel has a much better fatigue life, and the weight savings isn't there when comparing to an aluminum rocker. Basically, I saw no benefit to the aluminum rockers over them, or the Crowers.

I simply chose the Ultra XD rockers, based on the fact they were 100 bucks or so less than the Crowers, and they were something new. I like new stuff to try.

Originally Posted by MrCIG (Post 4521892)

Joe are those Ultra XD's made in the USA? I will probably replace my Crane Gold rockers as a couple have some play in them that I don't like

Mark

Originally Posted by MILD THUNDER (Post 4521926)

I do not know where they are made Mark. The Crane Golds used to be made in USA, but I do not think they are anymore. The Scorpion rockers are made in USA.

http://www.compcams.com/ultrapromagnum/

http://www.chevyhardcore.com/tech-st...asters-degree/

https://www.youtube.com/watch?v=UrWK73ysF3Y

Originally Posted by getrdunn (Post 4521936)

That's pretty amazing lifetime warranty. Although I've always had great success with crane golds I know what I will be using in any future builds. What a nice piece.

Originally Posted by MILD THUNDER (Post 4521940)

That was my thoughts as well. I was trying to find a set of new crane 1.7 rockers with the TR fulcrums, but nobody had them in stock, anywhere. I decided to look into other options, and thats when I found these, and began looking into them.

I talked to too many people/engine builders that had Scorpion breakage the past few years, and that ruled those out for me.