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I would NEVER trust an aluminum rocker for a performance app. I have the old Pro-mags and have never had an issue.
Crane Gold Racing aluminum rockers here. They've been pressing on 250lbs of seat pressure and 500lbs with the valves open up to 7200rpm for the last 3 years. Is this a Bert law of ridiculousness that you've held on to.
__________________ 1996 Chevrolet Camaro Z28 SS #597 M6
Originally Posted by z28SSilvest
You sir, are a genius with the mind of a 10 year old.
Go into any performance machine shop and say this and they will laugh you out the door.
That might be true but I dont claim to be a professional or a know it all. I base the statement on I have seen several posts where bearings sliding out were the issue. But I have NEVER seen a problem with a Pro-mag. In all fairness they could have been cheap Chinese junk.
Just knowing what I know, I feel better with the Pro-mag knowing the chromeoly steel is stronger than aluminum..
it is my understanding that aluminum rockers are more race oriented rather that daily driver friendly. i could be wrong but thats what i get from it
This may be true, but with all these knock off no name brands making "performance aluminum rockers" you really get what you pay for. There is nothing wrong with aluminum but I wouldn't buy the cheapest set I could find.
iv had pro mags on my last motor. these new ultra magnums seem much better. it kinda looks like comp is phasing out pro mags and replacing them with ultras. if u check jegs, they dont have a big selection of pro mags anymore but the selection of ultras is huge
I have a new set of pro mags. Can't hear a thing out of them. Very quiet. I bought them for longevity on a street/strip engine. I was afraid aluminum would suffer from metal fatigue over time and break. True or not, I prefer the peace of mind.
A buddy of mine broke a Crane aluminum rocker just a week ago. The broken area showed horrible porosity.........the kind I would not expect to see even in a cheap Chinese casting! If you had that kind of porosity in a steel rocker, I'd expect it to fail eventually too. It just goes to show, there are quality escapes everywhere.......you just have to go where you feel your odds are best.
Running ProMags here.
__________________ Pat Gish - 1996 Impala SS
Stock shortblock, AI cam/heads
10.98 @ 122 on motor, 10.35 @ 128 on the 100-shot 2012 ImpalaSS Nationals SSuperPro Champion 2013 ImpalaSS Nationals SSuperNatural Champion 2013 ImpalaSS Nationals Roadrace RunnerUp