Gath47

As far as I can tell the part number for the OEM 2005 LS2 lifters is: 17122490, but virtually no one sells them.

Instead it appears that the GM LS7 high performance lifters (12499225) are the suggested replacement part. I've seen some sites suggest that it's an improved design and these are a fully compatible replacement part.

I've actually put these lifters side by side and noticed that the depth of the pushrod seat is less on the LS7 lifters. This implies to me that you would want a shorter pushrod, but I've never seen anyone state that there is any such requirement. Can anyone who has actually done this swap confirm that they can replace the OEM with no change in setup?

69LT1Bird

iTrader: (1)

Do a search, this has been BEAT to death on here.

"OEM LS2 Lifters" replaced by "LS7 High Performance Lifters", not a High Performance lifter, just a stock replacement for every LS non DOD lifter.

NXZ28

iTrader: (45)

Exactly. I agree with the LS7 not being a high performance lifter. If you plan on running an agressive lobe like a Comp Cam XER then get a set of good lifters like Morels, Lunati, and even Comps. My brand new LS7 lifter lost the roller wheel and it went through my motor. Fun Times.

Cstraub

iTrader: (1)

Go Morel and never look back....

BES Stroked Nova

iTrader: (24)

I 2nd that

tektrans

iTrader: (23)

I've got a killer set of Jesels for sale if anyone is interested.

Gath47

Thanks, I just wanted to make sure this wasn't the cause of my latest issue (lifter turned and ground down). Will post another thread regarding that in particular...

NOS327

iTrader: (30)

How aggressive is "aggressive" exactly? I just ordered a smallish LSr cam (the 273 http://www.summitracing.com/parts/CCA-54-457-11/). Think an LS7 lifter would be sufficient or should I upgrade?

Sid447

If there's any doubt, ....there's no doubt.
That, is going to be seriously hard on your valve-train.

Deal with certainties and avoid possible trouble.

69LT1Bird

iTrader: (1)

If you have low mileage, the trays are in good condition, the engine has been properly maintained, these lifters do not fail as much as people think. Remember, you are reading a forum about LS1 based engines. The percentage of people who own and build these engines compared to how many people use these forums is very skewed. If things are going good, people say nothing, one tick an all the whiners come out. There are several million of these lifters in engines and are working fine. If you are building a purpose built race car, out in Morels, a DD or street car, the LS7 style is fine. Call some of the big sponsors on here and talk to them, they do this everyday and most do it right. The DIY builder may not have set up the springs correctly, did not correctly measure pushrod length, etc.

As for this quote, WTF is that about, at least add some useful input.

Sid447

...."If there's any doubt, ....there's no doubt.
That, is going to be seriously hard on your valve-train.
Deal with certainties and avoid possible trouble."



It's my opinion,

Last I heard this was a public forum.

It's in plain english; if you have a problem with it or can't understand the meaning, just try and be mannerly and ignore it.

ringram

It was an IQ test

69LT1Bird

iTrader: (1)

That cam is less aggressive, as far as ramp rate, than the XER lobes. 223/231 should not cause any issues.

DamianN.

iTrader: (11)

haha

melsie68

iTrader: (8)

I have sucessfully run Comp LSK with the LS7 lifters on the street and at the track. I used 3/8 pushrods, stock LS1 rockers and 1.460 diameter springs with 155/425 pound seat/open spring pressures. I had no problems whatsoever.

camarols1

iTrader: (17)

I would bet valve float is the real killer of many OE lifters that had an improper spring setup or the wrong pushrods.
But you can't go wrong with a premium aftermarket, although I don't think it is needed with that cam.

rsz288

Sadly so true .

printmanjackson

iTrader: (1)

I second that