Roller Rocker Question
Teching In
Joined: Apr 2008
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heads hi there just wondering what the flow potential of the lt1 1995 cylinder heads were and can you get away with 11.1 com because of the reverse cooling in the heads thanks
Are you talking a hydraulic roller cam or solid lifter, roller cam?
I've got GMPP roller rockers with the Comp Cams hydraulic roller lifters in my LT-1, and I've set the lash at 1/4 turn down from "zero lash". CC says to set them at 1/8, and I normally woldn't argue with a manufacturer on how to use their products, however at 1/8 turn, I was getting a noticible "ticking".
I've got GMPP roller rockers with the Comp Cams hydraulic roller lifters in my LT-1, and I've set the lash at 1/4 turn down from "zero lash". CC says to set them at 1/8, and I normally woldn't argue with a manufacturer on how to use their products, however at 1/8 turn, I was getting a noticible "ticking".
TECH Veteran
Joined: Apr 2008
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'93
assume you are talking about "hydraulic roller" cam....1/4 turn past zero lash
iff solid cam, spec for lash should be on the cam card
Leadfoot:
if you have the COMP 875R lifters....the lash REALLY needs to be zero to 1/8th turn MAX. Excessive cam lobe wear or failure will resuly if you lash the 875's to tight. The 875's will have more "noise" than the 850's
If you have the 850's than 1/4-1/2 is fine
assume you are talking about "hydraulic roller" cam....1/4 turn past zero lash
iff solid cam, spec for lash should be on the cam card
Leadfoot:
if you have the COMP 875R lifters....the lash REALLY needs to be zero to 1/8th turn MAX. Excessive cam lobe wear or failure will resuly if you lash the 875's to tight. The 875's will have more "noise" than the 850's
If you have the 850's than 1/4-1/2 is fine
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I do have the 875s, but at 1/8 turn they were quite noisy. It just didn't seem right.
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Verdad Gallardo OK, I had a little spare time today...I backed off the preload by 1/8 turn, so it's now at 1/8 turn. The biggest PITA to this job is removing the shock tower brace so I can get the valve covers off.
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875's I have seen a cam lobe wiped because of to much preload on the 875's
My $02 is you did the right thing by backing the lash off.
Hard to believe that they have so little plunger travel that 1/8 turn will make that big a difference....I mean if you cranked it down 1 full turn, and then went 1/8 MORE, I realize that would be a big concern. But, to go 1/4 turn from zero lash instead of 1/8 turn, and risk taking out a cam....WOW!!
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lead..
the 875's are almost solid lifters, they do not want more than 1/8 turn. Very little travel in their plungers. good lifters, just need to be lashed correctly. they can rev higher than the 850's
I have the cam but no pic in my files.....1/2 turn fing wiped the lobe in less than 2000 miles.
the 875's are almost solid lifters, they do not want more than 1/8 turn. Very little travel in their plungers. good lifters, just need to be lashed correctly. they can rev higher than the 850's
I have the cam but no pic in my files.....1/2 turn fing wiped the lobe in less than 2000 miles.
