Will LS7 lifters hold up?
08-03-2013, 07:43 AM
#5
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
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08-03-2013, 08:54 AM
#8
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.
08-03-2013, 10:37 AM
#12
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.
08-03-2013, 04:41 PM
#13
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I wouldn't be reving mine above 6500. I don't race it so maybe the LS7's are the way to go. I would hate to spend allot extra for the morels if the LS7 lifters would a reliable option.
08-04-2013, 10:29 AM
#18
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
08-05-2013, 08:06 AM
#19
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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.
