L33 lifters are LS7
Thread Starter
Joined: Dec 2018
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From: Midwestern Illinois
L33 lifters are LS7 I ready an old thread a while ago but can't find it now. It stated that the 05+ L33 lifters are the exact same as the Ls7 lifters. Can anyone confirm this?
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From: Central Cal.
LS7 lifters are the standard replacement lifter.
When the LS7 came out, any other lifter was discontinued.
There is nothing unique about the LS7 lifter.
It is just the most up to date of the standard LS lifters
When the LS7 came out, any other lifter was discontinued.
There is nothing unique about the LS7 lifter.
It is just the most up to date of the standard LS lifters
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From: Seattle
if there's nothing wrong with the ones you have now, no. Remember, the LS7 lifters are not "performance", just OEM replacements.
if you want performance replacements, look at Morel / Summit SUM-HT217-16 (summit sells Morel as their house brand)
if you want performance replacements, look at Morel / Summit SUM-HT217-16 (summit sells Morel as their house brand)
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I'm not sure why people actually refer to them at LS7 lifters anyway. They're technically just Gen 4 lifters since the old lifter was phased out immediately after they were released.
Quite a bit of confusion as which came first or what is what.
Ls7/delphi design did not come out til 06 with the ls2 and introduction of the ls7. Thats why they are called "ls7 lifters"
Since L33 came out in late 04/05, not all l33 ifters are ls7 lifters.
The issue now is that is a blanket statement for too many knock offs.
The ls7 lifter is solely made by delphi. The gm pn 12499225 has always been the pn for 16 legit ls7 delphi lifters. Any other pn used can be any number of different brands and styles.
The delphi is set apart from other lifter designs in 2 major physical ways.
1. Swaged roller axle ie non floating axle
2. Oil hole 90* off from locating flats. This means the oil feed hole can face front or rear of engine. Usually you want them all placed to the rear so as to be fed first
The body of the lifter has a much better casting and is very smooth.
Thats just a small explanation but hopefully helps. We do carry both the gm pn, which has changed from the most affordable lifter set out there, to nearly as expensive as many machined/billet lifters available.
We do buy them in bulk also to save the customer money but ensure a high quality still.
Definitely never soak them though. This isnt 1989. Lube the roller, body, and pushrod cup, and install. Simple, easy, and quick.
Ls7/delphi design did not come out til 06 with the ls2 and introduction of the ls7. Thats why they are called "ls7 lifters"
Since L33 came out in late 04/05, not all l33 ifters are ls7 lifters.
The issue now is that is a blanket statement for too many knock offs.
The ls7 lifter is solely made by delphi. The gm pn 12499225 has always been the pn for 16 legit ls7 delphi lifters. Any other pn used can be any number of different brands and styles.
The delphi is set apart from other lifter designs in 2 major physical ways.
1. Swaged roller axle ie non floating axle
2. Oil hole 90* off from locating flats. This means the oil feed hole can face front or rear of engine. Usually you want them all placed to the rear so as to be fed first
The body of the lifter has a much better casting and is very smooth.
Thats just a small explanation but hopefully helps. We do carry both the gm pn, which has changed from the most affordable lifter set out there, to nearly as expensive as many machined/billet lifters available.
We do buy them in bulk also to save the customer money but ensure a high quality still.
Definitely never soak them though. This isnt 1989. Lube the roller, body, and pushrod cup, and install. Simple, easy, and quick.
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From: Central Cal.
I sorta remember something here a while back (yeah, THAT nails it down...lol) to the effect that soaking lifters fills the chamber under the piston, causing the lifter to hold the pushrod at the top of its travel, possibly holding the valve open a bit when it should be closed.
As I remember it, but nothing that may happen is my fault..... ever...
As I remember it, but nothing that may happen is my fault..... ever...
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Brett Foote Because they already have lubrication inside them. When you soak them you give opportunity to trap air inside them, making them noisy and not operating properly.
It can get way worse than that but thats the most common issue.
And before the comment "well thats how they operate" they dont operate that way. They operate under hydraulic conditions. Soaking them isnt that.
Also engine oil is so thin, it would have near 0 lubrication ability after a few minutes out of the oil bath and in an engine where gravity would leave it in the bottom of the oil pan.
The better question is, why waste time soaking?
It can get way worse than that but thats the most common issue.
And before the comment "well thats how they operate" they dont operate that way. They operate under hydraulic conditions. Soaking them isnt that.
Also engine oil is so thin, it would have near 0 lubrication ability after a few minutes out of the oil bath and in an engine where gravity would leave it in the bottom of the oil pan.
The better question is, why waste time soaking?
The lifters are soaking in oil when installed (when engine is off all that oil runs back down on top of lifter) so I can't see soaking them before installing making any difference other than wasting time. If they fill up they may hang a valve open momentarily, so I wouldn't start it immediately.
Because they are under a hydraulic condition. As i said above. It makes a very big difference. You arent loading up only one chamber with oil when you soak them. Its a completely different scenario.
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05 LH6s do in fact have the newer style lifters for the non-DoD ones.
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The Ls7’s were developed for the Ls7 and are an improvement, but as GM does-they consolidate as much as possible and N/A stuff 10 years when their contract with the manufacturer runs out for service parts. If the Ls7 costs no more and is better, it makes sense that they keep it. The travel is .166 so less oil to aerate -which results in less net lift loss compared to a .210 travel old style We carry the ht-214 replacements, the ht-215 Delphis, and the ht-217’s made for us by Morel. We’d call them more of a Private label part rather than house brand because we carry several at different price points, but good thread here and good post by WS6. Doing our plunger travel testing we find they are pretty full of oil even to begin with.
Last edited by Summitracing; Feb 4, 2022 at 10:11 AM.
The Ls7’s were developed for the Ls7 and are an improvement, but as GM does-they consolidate as much as possible and N/A stuff 10 years when their contract with the manufacturer runs out for service parts. If the Ls7 costs no more and is better, it makes sense that they keep it. The travel is .166 so less oil to aerate -which results in less net lift loss compared to a .210 travel old style We carry the ht-214 replacements, the ht-215 Delphis, and the ht-217’s made for us by Morel. We’d call them more of a Private label part rather than house brand because we carry several at different price points, but good thread here and good post by WS6. Doing our plunger travel testing we find they are pretty full of oil even to begin with.
Along with ACTUAL *stock* pushrod length. The amount of customers worrying about that OR trying to argue about it is
