SlowLS1C5

Ok just did a MS4 on a LS1 and fire it up it runs good for a minute then started running rough and getting loud. Take the valve cover off on the Pass side and boom rocker needle bearings everywhere. Clean it all up because I guess its common from what I see put a another one one, start it up runs for about 1 and a half then boom I hear a noise, shut it down instantly pull the same cover and the same one broke but this time its the new one. Double checked the pushrod length its good and nothing else is visibly wrong. Any thoughts? I can only think that the particular lobe was not cut enough and its has too much lift going on.

sroach20

iTrader: (31)

what did you set the torque on the rocker bolts to?

SlowLS1C5

Same as usual 24 lbs.

lmt0705

iTrader: (7)

wow, put a dial indicator on the top of the rocker stem and verify the amount of lift

heavymetals

iTrader: (3)

Could be the spring coils are binding from the lift.

Ping King

iTrader: (20)

whats the preload? is the rocker touching the spring correctly

ae13291

iTrader: (8)

hope you get the problem solved! is the same rocker both times?