i saw an ad in GMHTTP for scorpion 1.6RR's, but i'm not familiar with their products. are they any good, or should i pay the extra $$ and get Crane's?

also, what tool do you guys use to remove AIR fittings?

 

Might as well get Pro Mags, they are lighter, stiffer and stronger. All of those things matter in valvetrain.

A good 7/16 1.6:1 Pro Mag is the way to go.

Bret

 

i've considered both crane and comp and i think i like the crane's better. plus, if GM trusts the cranes as factory equip. on LT4's, i certainly can. but back on topic, does anyone know of the scorpion brand? good/bad?

 

Ive never heard of em failing, but they are used alot less then a comp or crane part. You get what you pay for.

On another note ive heard of a noticable amount of crane rockers failing. Yet to hear of a comp failing. I think the comp design is head and shoulders abouve the crane design. Take both rockers and hold em by the trunion and feel the weight at the tip. The comps are very noticably lighter. Thats the recricating weight, thats where you want it to be lighter. Also aluminum has a fatigue life, it slowly weakens more and more every time its stressed. A steel rocker like comps is much more resistant to fatigue failures. Id spend the little extra to get the proven reliability of the comp product. Just my .02

 

I have the 1.7 scorpion's they are quality made. Little on the heavy side, but heck they are basicly big block rockers,lol I like them and they are cheap $202. from flatlander racing.com

 

Yeah, try taking the trunions out of them finding the mass and then doing a deflection analysis of them the Pro Mags kick serious but there. They are one dam bargan for the price in my eyes, but then again what the hell do I know.

Bret

 

There good rockers, I had a set of 1.7's. They are big and heavy for a RR. And you have no idea how much that matters. Imagine that thing rocking back and at 6k rpms. It gets real heavy at that speed. The comps are lighter and stronger. I will getting my new set of Pro mags today that are 1.6, 7/16 stud. I will weigh it and then weigh one of my Scorpion 1.7. Instead of saving a little to get the cranes get the pro mags. The scorpion is a good rocker they seemed to have fixed some of cranes problem areas, ie strength. But the Pro mags are the best.

 

Well, you can't just weigh the rocker, you need to only weigh the part of the rocker that moves. The trunion on the Pro Mags is huge so it makes up a good portion of the weight, but it doesn't move so it doesn't matter. The weight over the pushrod and the valve tip is what matters. The Pro Mags still some out lighter, even though they are chrome moly and the scorpions are aluminum.

I would spend the little extra cash for the NSA Pro Magnums, in fact, I did.

Dan

 

The reason for that is due to all of the "oh GOD no! Don't use anything BUT comps. There is a reason that everyone and their brother used to put shorties and hotcam on a camaro. It was all that anyone had ever tried, and people are scared to use something new. I had the scorpions, and there is nothing wrong with them.

 

I've seen Scorps run on guys who win circle track championships. They aren't bad....

They aren't Pro Mags.... and guys were are getting to the point where we are pushing Hyd Roller stuff now, lightweight springs and retainers, spinning them to 7000rpm etc... It's always a good idea to get something that will work with a good setup down the road. That's why I say this.

Bret

 

wow, this get thicker the more i dig into it! ok so, nasty bird says he knows of crane's failing? then why does GM elect to use these on LT4 motors? what about the ones that GM themselves make with the chevy logo stamped?

also, why are comps less $$ than cranes if they are superior?

 

Production costs.... Why do things have to cost more to be better? Hell the COMP Aluminum rockers cost more than the Pro Mags.

Crane makes GM aftermarket cams so it makes sense that they deal with them on aftermarket rockers too. Plus the spring loads on the Hot Cam or LT4 setup are pretty low in comparison to what we run on HR setups on the edge.

Bret