warlock007

I have completed alot of mods, upgrades and still have this tac tac tac sound, let me try to explain.

If I put a stethoscope to the outer cover of the drivers side from front to back i can hear the rockers but they are quiet 2 out of 10 on noises. I go to pax side and from front to back noise level is 2-4-8-10. I put it over each rocker to receive this noise.

I took off the covers again, checked torque, springs, rods everything seems to be spot on. I am running Johnson link lifters which have been pretty solid but when i first put them in and turned over, the pressure out of the rockers was strong(shot out of the hole) now they are back to the standard LS1 way. I checked both sides and they are the same.

I put the stethoscope on each rocker with cover off and could not hear the tac tac sound, its only with the cover on.

Oil pressure is good with engine running, 35 hot 40 cold idle 49-55 under RPM pressure. no loss of power.


things done,

243 heads ARP head studs
cam
36lb injectors
918 beehive springs, push rods, rocker guides and trunions, link lifters
ported LS6 intake, lower 2004 valley cover PCV upgrade and catch can
XS power headers to tails, catted
flex plate, torque tube rebuild, 2400 tci stall
oil pump
water pump
LS2 timing chain
air pump eliminated
rear O2 tuned out
Tuned but need retune by Chuck Cow

This is driving me crazy, there is something not right but I just cant put my finger on it. Need help

woodman300

maybe its a simple clearance issue with the valve covers.

warlock007

I checked for any scaring at all and found nothing.

crimsonwake

Roller rockers?

warlock007

Stock

dblerman

Did you measure with a push rod length checker to make sure you had the correct push rods? And did you install your rockers as per the service manual procedure, or did you just throw all your rockers on at once and torque to 22ft lbs? Whenever I head about excessive valve train noise the first 2 things that come to mind are incorrect push rod length and improper pre-load. Both of which are likely if following the LS1howto and not using a service manual.

vettenuts

Someone on tech from NH had a similar issue with those lifters. Unfortunately he had to replace them but Johnson helped with the cost and replaced the lifters because it was a QC issue. I can provide you his contact information if you want via PM.

The fact that you are seeing the oil volume decrease may indicate the lifters themselves may be a issue. Have you contacted Johnson directly and spoke to them?

warlock007

That would be great.

I called them but Jason was in meetings.

warlock007

I installed per book.

Comp push rod checker used.

Rechecked torque to make sure hadn't loosened up. Everything looks good. Pull rods and could see through but used air to clear.