Scorpion rockers
#52
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I had Erson junk rockers on my old engines thats what one engine had when I got them, the other had PBM rockers, no issues, them Erson looked like complete junk made in a garage, but never issues, I think most issues are unstable valvetrain or setup.. I might be wrong though...
#54
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.
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.
Mark
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If you like it rough do it OFFSHORE!!!
If you like it rough do it OFFSHORE!!!
#55
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http://www.compcams.com/ultrapromagnum/
http://www.chevyhardcore.com/tech-st...asters-degree/
https://www.youtube.com/watch?v=UrWK73ysF3Y
#56
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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
http://www.compcams.com/ultrapromagnum/
http://www.chevyhardcore.com/tech-st...asters-degree/
https://www.youtube.com/watch?v=UrWK73ysF3Y
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.
Last edited by getrdunn; 01-22-2017 at 07:06 PM.
#57
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I talked to too many people/engine builders that had Scorpion breakage the past few years, and that ruled those out for me.
#58
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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.
I talked to too many people/engine builders that had Scorpion breakage the past few years, and that ruled those out for me.
#60
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has it been hitting on the valve cover ?