I keep breaking rocker arms
I keep breaking rocker arms I have a 99 transam. It has a comp cam. 588/581. 224/230. 114lobe sep. With trick flow 215cc heads fast90/90. On dyno it did 465whp 431wtq. It ran out of fuel. 1 week later I put a 255lph pump in and stock GTO injectors in. 100degree day car did 455whp on dynomax power to wheels tour. 20 min later it broke a scorpion 1.7 rocker arm. (#7exhaust). Yesterday on dyno it broke #4 intake rocker. #6 exhaust is cracked.
Are the scorpion rocker arms just that cheep. The place I got them from is willing to give me a new set or exchange them for the harland sharps.
What do I go with????
Should I got to 1.8. Or stay with he 1.7???
Any help is great. Thanks.
afasttransam
Are the scorpion rocker arms just that cheep. The place I got them from is willing to give me a new set or exchange them for the harland sharps.
What do I go with????
Should I got to 1.8. Or stay with he 1.7???
Any help is great. Thanks.
afasttransam
I have heard and read that these rockers don't handle the stress very well from the fast ramp cams. If you can get a set for free that's great. I would sell them to somebody with a stock cam.
Same complaint posted here less than two weeks ago, at first I thought you were the same guy making another thread, you are not the only one ditch the scorpions they are known to break, get the harland sharps and be done with it.
Oh and stay 1.7's all the latest cams say do not use with 1.8's. Check out the cam listings on Thunder or Texas Speed says it at the bottom of the cam description.
Oh and stay 1.7's all the latest cams say do not use with 1.8's. Check out the cam listings on Thunder or Texas Speed says it at the bottom of the cam description.
At one point I was thinking of going with 1.8 rockers and just about everybody I talked to that sold cams said they didn't recommend the higher rocker ratio because of the aggressive lobes on these LS cams. I'm sure some poeple have done it but I didn't want to take the chance of breaking a spring
wow thanks mine broke the same way his did. two times on two diff cylenders and one about to go. only problem i have now is finding the other half of the arm in the head. thanks for the help 1.7 harland sharps going on tomorrow than hopefully it will get retuned.
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For what its worth I myself have not seen one negative post on Harland Sharp and also a little bit of interesting info.... Harland Sharp invented the roller rocker, I believe all the way back in the 50's, so they have a lot of years experience in making these rockers. Scorpion may be ok I think they are relatively young??? so they will probably figure it out and get it right
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This seems to be happening more and more with the Scorpion rockers. I prefer either Crane or Yella Terra, but if you can't even exchange for them get the HS 1.7's. Personally, I would be very hesitant to re-install the Scorpion's at this point. If you got out of this with no other damage, go with another rocker and don't take the risk.
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I have a 2001 corvette with ls6 just over 5oo horse and have broken both Scorpion's and Harlan. Actually going back to stock. Pain in the butt. Broke one Scorpion and 2 Harlans
Last edited by Cobra77; Aug 3, 2016 at 09:38 AM. Reason: added info
