Will LS7 lifters hold up?
Down at the bottom of the link below you can find a post that is just scratching the surface of why some pretty big named builders are quietly shifting to Johnsons. Some have picked up > 50hp and 500 more RPM until float on a lifter change (from Morels), not that Im knocking them. Im just aware of some of the latest results. Morel are obviously fine and proven.
https://ls1tech.com/forums/showthrea...621905&page=22
https://ls1tech.com/forums/showthrea...621905&page=22
I'll be one of the guys going to Johnson's here in the near future as well.
Having said that, I've got .631 on both intake and exhaust and my car runs like a champ with the LS7's. No issues.
Having said that, I've got .631 on both intake and exhaust and my car runs like a champ with the LS7's. No issues.
Trending Topics
Not to hijack the thread but I'm running the ls7 lifters with my ms4 and I do have valvetrain noise at low rpm's when the car is hot. I've been running the ls7's for 7k miles now without issue. I'm not real concerned with the valvetrain noise. I've heard the noise with the ms4 is normal.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
There was nothing in this thread that led me to believe that the slr's were any better than running ls7s. Brian kind of even says it towards the end of the thread.
https://ls1tech.com/forums/generation-iii-internal-engine/1629882-anyone-running-brian-tooley-slr-lifters.html
Their internals with those are much better toleranced than the ls7s which is why you get more net valve lift, but they're also more prone to valve float if you're to the point you're lofting the valve train - slow leak rate = takes longer to bleed down. I've also heard of Brian actually recommending ls7s over the BTR's.
If you're after a good lifter, get some morels or Johnson's. spintron data confirms them to be 2 of the best options available on the market.
https://ls1tech.com/forums/generation-iii-internal-engine/1629882-anyone-running-brian-tooley-slr-lifters.html
Their internals with those are much better toleranced than the ls7s which is why you get more net valve lift, but they're also more prone to valve float if you're to the point you're lofting the valve train - slow leak rate = takes longer to bleed down. I've also heard of Brian actually recommending ls7s over the BTR's.
If you're after a good lifter, get some morels or Johnson's. spintron data confirms them to be 2 of the best options available on the market.
I ran the LS7s for a few years (about 36k miles) with .646/.612 lift and spun it to 6900rpm n/a and spray with no problems. Don't forget, the c6 zo6 boys spin much higher rpms after they do cam installs.... 7200 ect
Wow I didn't know they use Johnson short travel lifters in Top Fuel 
That is a pretty big sweeping statement, I would just state your personal experience, because just a few weeks ago you had morels and thought those were the cats meow...
I know of 4 people personally that have had ls7 lifters fail and take out a cam...and I also know of lots more making the same power and their ls7s are fine...keep the ramp rates soft and valves light, a good spring with not huge open rates is a good idea too...
I have morels and they have worked so far for me nicely...Johnson's seem to be a decent lifter too but I have no first hand experience, and if you do go with the ls7s make sure you check the rollers out and they roll freely and smoothly out of the box...I have felt a few brand new ls7s that were gritty when rolled...I am not sure if their quality control has improved in the last year but it seemed to be less that up to par before
That is a pretty big sweeping statement, I would just state your personal experience, because just a few weeks ago you had morels and thought those were the cats meow...
I know of 4 people personally that have had ls7 lifters fail and take out a cam...and I also know of lots more making the same power and their ls7s are fine...keep the ramp rates soft and valves light, a good spring with not huge open rates is a good idea too...
I have morels and they have worked so far for me nicely...Johnson's seem to be a decent lifter too but I have no first hand experience, and if you do go with the ls7s make sure you check the rollers out and they roll freely and smoothly out of the box...I have felt a few brand new ls7s that were gritty when rolled...I am not sure if their quality control has improved in the last year but it seemed to be less that up to par before
There was nothing in this thread that led me to believe that the slr's were any better than running ls7s. Brian kind of even says it towards the end of the thread.
https://ls1tech.com/forums/showthread.php?t=1629882
Their internals with those are much better toleranced than the ls7s which is why you get more net valve lift, but they're also more prone to valve float if you're to the point you're lofting the valve train - slow leak rate = takes longer to bleed down. I've also heard of Brian actually recommending ls7s over the BTR's.
If you're after a good lifter, get some morels or Johnson's. spintron data confirms them to be 2 of the best options available on the market.
https://ls1tech.com/forums/showthread.php?t=1629882
Their internals with those are much better toleranced than the ls7s which is why you get more net valve lift, but they're also more prone to valve float if you're to the point you're lofting the valve train - slow leak rate = takes longer to bleed down. I've also heard of Brian actually recommending ls7s over the BTR's.
If you're after a good lifter, get some morels or Johnson's. spintron data confirms them to be 2 of the best options available on the market.
Now valve train is quieter. I spin the motor to 7000 RPM rev limit 1st-2nd blowing the tires off. The thing revs like a 2 stroke. I am very happy with the SLR lifter.
Like you said as long as the rest of your valve train is in check there should be no problems with either lifter, but the SLR is better in my opinion.
I am running an XFI intake lobe and a XER exhaust, Brains springs and titanium retainers, and Ferrea solid valves that TEA put in my heads. Stage 2 LS6 port work.
