2002 LS1 loud valve-train - Scorpion rockers?
03-05-2016, 02:47 PM
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2002 LS1 loud valve-train - Scorpion rockers? I've done tons of research on these loud valvetrains for the LS1 but I can not find the answer. Prior to me messing with it there was a tick from what I assumed was a bad lifter but it was not terrible. Since I was doing a chassis swap I decided to upgrade the torque converter and install new lifters and rockers. I popped off the heads and swapped brand new Summit Lifters and Scorpion 1.7 rockers. I was unaware of pushrod lengths at the time. After the install the clattering noise was even worse than before. It is so loud that you can hear it from the driver's seat and when cruising through the neighborhood. I understand some noise is to be expected but not like this. I figured the PR were to short so I ordered 7.425 and installed them. No noticeable difference in noise but maybe a loss of power, not sure. So I ordered a pushrod length checker and this is what I got:
#1 Intake = 10 turns, Exhaust = 10.5 turns, 1.75 / 1.25 turns to torque
#2 Intake = 10.5 turns, Exhaust = 10.5 turns, 1.25 / 1.25 turns to torque
#3 Intake = 10.5 turns, Exhaust = 10.5 turns, 1.5 / 1.75 turns to torque
#4 Intake = 10.5 turns, Exhaust = 10.5 turns, 1.25 / 1.25 turns to torque
#5 Intake = 10.25 turns, Exhaust = 10.5 turns, 1.75 / 1.75 turns to torque
#6 Intake = 10.5 turns, Exhaust = 10.5 turns, 1.5 / 1.25 turns to torque
#7 Intake = 10.25 turns, Exhaust = 10.5 turns, 1.5 / 1.25 turns to torque
#8 Intake = 10.5 turns, Exhaust = 10.5 turns, 1.25 / 1.25 turns to torque
With these numbers I went back to what I had in there which were 7.400 and removed the 7.425 rods. Everything I read says 1.25 - 1.75 is good to go. They averaged 10.5 turns which is .525, add that to the 6.8 and I got 7.325. Now the question is preload. With a 7.325 to zero lash I have read I should go from .050 to .075 and even up to .100 for preload. With that said, the 7.400 should be fine. Well it still clatters, especially from 1500 to 3000 rpm. Soooooo, what say you experts out there. Below is a video link to see the play in the arms after it sat all night and the oil bled out. I figured the oil pressure should be compensating for that. My guess is the rockers are just really loud but I have not found anyone complaining of that either.
Video Lifters http://www.summitracing.com/parts/su...cLGRoCOqTw_wcB
Rockers http://www.summitracing.com/parts/scc-scp1098
2002 LS1, stock lower end, stock heads and intake, 223/231 .610/.617 cam, double valve springs and roller rockers.
#1 Intake = 10 turns, Exhaust = 10.5 turns, 1.75 / 1.25 turns to torque
#2 Intake = 10.5 turns, Exhaust = 10.5 turns, 1.25 / 1.25 turns to torque
#3 Intake = 10.5 turns, Exhaust = 10.5 turns, 1.5 / 1.75 turns to torque
#4 Intake = 10.5 turns, Exhaust = 10.5 turns, 1.25 / 1.25 turns to torque
#5 Intake = 10.25 turns, Exhaust = 10.5 turns, 1.75 / 1.75 turns to torque
#6 Intake = 10.5 turns, Exhaust = 10.5 turns, 1.5 / 1.25 turns to torque
#7 Intake = 10.25 turns, Exhaust = 10.5 turns, 1.5 / 1.25 turns to torque
#8 Intake = 10.5 turns, Exhaust = 10.5 turns, 1.25 / 1.25 turns to torque
With these numbers I went back to what I had in there which were 7.400 and removed the 7.425 rods. Everything I read says 1.25 - 1.75 is good to go. They averaged 10.5 turns which is .525, add that to the 6.8 and I got 7.325. Now the question is preload. With a 7.325 to zero lash I have read I should go from .050 to .075 and even up to .100 for preload. With that said, the 7.400 should be fine. Well it still clatters, especially from 1500 to 3000 rpm. Soooooo, what say you experts out there. Below is a video link to see the play in the arms after it sat all night and the oil bled out. I figured the oil pressure should be compensating for that. My guess is the rockers are just really loud but I have not found anyone complaining of that either.
Video
Rockers http://www.summitracing.com/parts/scc-scp1098
2002 LS1, stock lower end, stock heads and intake, 223/231 .610/.617 cam, double valve springs and roller rockers.
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