Lifter question
Thread Starter
Race Director
Joined: Aug 2005
Posts: 13,592
Likes: 187
From: Hudson WI
NCM Sinkhole Donor
Lifter question
So if you have an LS2 with a relatively mild cam, would you use stock lifters, LS7 lifters, or aftermarket lifters. The motor will never see more than 7,000 RPM.
Thanks!
Tim D.
Thanks!
Tim D.
Pro
Joined: Nov 2006
Posts: 667
Likes: 0
From: Eagle River Alaska
Your limitation is NOT the cam - it is your valvetrain and your rod bolts. LS series engines have weak rod bolts and at high RPM, have a tendency to separate - and putting a rod through the side of your block. The other limitation is your valvetrain. The hydraulic lifters will either pump up or collapse at sustained high RPM (above 7000) and the stock roller rockers will flex under that kind of sustained load. You stated that you would not take your motor that high though.
I use: Ultralite Ls1/Ls2 Shaft Rocker 1.7:1 ratio.
I use: Ultralite Ls1/Ls2 Shaft Rocker 1.7:1 ratio.
Thread Starter
Race Director
Joined: Aug 2005
Posts: 13,592
Likes: 187
From: Hudson WI
NCM Sinkhole Donor
Your limitation is NOT the cam - it is your valvetrain and your rod bolts. LS series engines have weak rod bolts and at high RPM, have a tendency to separate - and putting a rod through the side of your block. The other limitation is your valvetrain. The hydraulic lifters will either pump up or collapse at sustained high RPM (above 7000) and the stock roller rockers will flex under that kind of sustained load. You stated that you would not take your motor that high though.
I use: Ultralite Ls1/Ls2 Shaft Rocker 1.7:1 ratio.
I use: Ultralite Ls1/Ls2 Shaft Rocker 1.7:1 ratio.
Will stock rockers with Camp Cam trunnions work?
Le Mans Master
Joined: Feb 2009
Posts: 5,169
Likes: 199
From: Your Sister's Bedroom
Yes, yes they will. People like to talk **** about them but GM puts a **** load of work into making sure things last for a very long time. Stock rockers are good, especially with the trunion upgrade. BUT... If you truly plan to spin that car consistently about 6K rpm I would invest in a nice set of comp or crane rockers.
Race Director
Joined: Dec 2005
Posts: 11,888
Likes: 107
From: God's Country, ID
Invest in a good set of after market lifters.
I've got a busted lifter stuck that will not exit out the top. Now after removing the heads I have to pull the friggen cam and hope I can get the lifter out somehow?
I'm not the only one that has had a lifter break at the roller/pin. It's a weak point.
I've got a busted lifter stuck that will not exit out the top. Now after removing the heads I have to pull the friggen cam and hope I can get the lifter out somehow?
I'm not the only one that has had a lifter break at the roller/pin. It's a weak point.
Thread Starter
Race Director
Joined: Aug 2005
Posts: 13,592
Likes: 187
From: Hudson WI
NCM Sinkhole Donor
Invest in a good set of after market lifters.
I've got a busted lifter stuck that will not exit out the top. Now after removing the heads I have to pull the friggen cam and hope I can get the lifter out somehow?
I'm not the only one that has had a lifter break at the roller/pin. It's a weak point.
I've got a busted lifter stuck that will not exit out the top. Now after removing the heads I have to pull the friggen cam and hope I can get the lifter out somehow?
I'm not the only one that has had a lifter break at the roller/pin. It's a weak point.
Le Mans Master
Joined: Feb 2009
Posts: 5,169
Likes: 199
From: Your Sister's Bedroom
Invest in a good set of after market lifters.
I've got a busted lifter stuck that will not exit out the top. Now after removing the heads I have to pull the friggen cam and hope I can get the lifter out somehow?
I'm not the only one that has had a lifter break at the roller/pin. It's a weak point.
I've got a busted lifter stuck that will not exit out the top. Now after removing the heads I have to pull the friggen cam and hope I can get the lifter out somehow?
I'm not the only one that has had a lifter break at the roller/pin. It's a weak point.
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Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
I have seen broken lifters on a stock LS6 that used LS7 lifters. The cam was a LPE GT2-3 which is only slightly larger than a LS6 cam and it used LS2 valve springs. Not very aggressive at all. But I can also say that breaking a lifter don't happen very often. In this case it was a customers track dedicated Z06 which sees sustained high RPM use.
Race Director
Joined: Dec 2005
Posts: 11,888
Likes: 107
From: God's Country, ID
Sorry, didn't get back to you sooner:
Car has been run soley on the street. Seldom have I exceeded 5800rpm and even that was for a very short duration.
Stock rockers & lifters, hardened pushrods, Mannley dual springs, cam is mild with only .581 lift.
Car has been run soley on the street. Seldom have I exceeded 5800rpm and even that was for a very short duration.
Former Vendor
Joined: Apr 2006
Posts: 2,470
Likes: 2
From: Portland OR
St. Jude Donor '10-'11-'12
The GM lifters are ok if your running a a mild setup or the GM springs and cam. When you swap stuff out and put a more aggressive cam in there and change the springs you change a lot of the dynamics and the GM lifters cant handle it. We use Morel lifters in our builds, they are a true hi performance lifter... Here its picture vs a an LS7 all the way to the far right...note the difference in construction..
These are link bar Morels ... one set is the Ultra Pro Morel.. We offer the best price on them.
The stock rocker is good after you rebuild the but they are limited as to how much lift you should run on the cam ( geometry)
These are link bar Morels ... one set is the Ultra Pro Morel.. We offer the best price on them.
The stock rocker is good after you rebuild the but they are limited as to how much lift you should run on the cam ( geometry)
Race Director
Joined: Dec 2005
Posts: 11,888
Likes: 107
From: God's Country, ID
The GM lifters are ok if your running a a mild setup or the GM springs and cam. When you swap stuff out and put a more aggressive cam in there and change the springs you change a lot of the dynamics and the GM lifters cant handle it. We use Morel lifters in our builds, they are a true hi performance lifter... Here its picture vs a an LS7 all the way to the far right...note the difference in construction..
These are link bar Morels ... one set is the Ultra Pro Morel.. We offer the best price on them.
The stock rocker is good after you rebuild the but they are limited as to how much lift you should run on the cam ( geometry)
These are link bar Morels ... one set is the Ultra Pro Morel.. We offer the best price on them.
The stock rocker is good after you rebuild the but they are limited as to how much lift you should run on the cam ( geometry)
They are failing on bone stock LS motors? I have a mild cam (.581 lift) and never run over 6000rpm's (if that) and yet the lifter just imploded (see pic above). I'm also questioning if the the lifters trays are wearing-out and the lifter is turning in the tray causing failure. The lifter tray that held my busted lifter has a silver ring inside? Not sure if the lifter spun first or grabbed first then spun? Another reason to get a link bar lifter. I'm definately not putting GM lifters back in only to have it take out another cam or worse.
