[lust4speed]

I'm not a fan of Scorpion rockers. Had one rocker in the set that should have been caught in even a cursory inspection at the factory since part of the mold gave way and the center slot was almost solid aluminum. Plus Scorpion seems to think that adding bulk to the rocker is the only way of increasing strength. Take a look at the photo above and notice the distance from the pivot fulcrum to the top of the lifter is massive. It is the least likely rocker to clear any valve cover except for the tall 3". If Cliff is breaking those, then all that excess aluminum isn't doing any good.

[Shiny]

To your point about strength of the Scorpions, the location of the cracks in Cliff's photo seems unexpected. I wouldn't expect tension loads there, which I associate with risk for cracking.

Why would they crack there? Bearing failure and then weirdness? Other design weakness in the bearing support "arms"?

Is this a common failure mode in other brands?

Mike

[PAUL K]

We had a recently rebuilt Pontiac engine come through our shop with Scorpion rocker arms and a HFT cam. I think seven of the rocker bodies were cracked around the front side of the trunnion area. The worse part of the deal was Scorpions unwillingness to help resolve the issue. The tech at Scorpion didn't seem to the the cracked rocker bodies were an issue since they're rocker arms bodies have a lifetime warrenty. But insisted the rockers are sent back by the shop that originally installed them.... We put HS rocker arms on and called it a day.

Next issue we had was with a new set of 1.65 Scorpions that had excessive run out on the roller tips making it impossible to adjust lash. Over half the rocker arms had .003 or more of run out.