Mirek

I am swapping my stock ls1 cam with a MTI C1 (222/222, .566 .566 112LSA)
Some very bright gentlemen @ the OEM i work at INSIST that i get new lifters to match the new cam.They say it is 101 and not to proceed if i do not plan on changing lifters.
Evidently the wear pattern on my old lifters will not match the new cam and it will wear the cam. Doing this requires removing the intake (i did not plan on doing that)
1. Do i have roller lifters ?(in which case they say i still SHOULD replace the lifters due to the existing wear pattern)

IS ANYONE DOING THIS ?

Fireball

iTrader: (21)

that statement you said is only true with FLAT TAPPET lifters. You do not need to replace lifters unless you damage one (collapse it). to change lifters requires pulling both heads as the lifter valley is under the head surface

DERTY

Mirek,

Most if not all of us who have done this with our motors have not changed the lifters. You will see a very mild wear characteristic if you were to look at them. But with the hydraulic roller design that is used stock it works just fine, even after a cam swap. I've done several and they all are still running really well.

Mirek

Thanks for the heads up these guys are DEAD SET on HAVING to change the lifters and once again they are OEM engineers and have built and been inside many many engines....what type of lifter do ls1 engines come with ?

Jabroni

They are a roller design. The side that rides on the cam lobes have a wheel on a bearing (a very basic description) that rolls on the lobe. The other side has a cup that the pushrod sits in. Lower wear and friction that flat tappet variety.

someday

GM has used roller lifters since 1987... where have these guys been??

MyLS1Hauls

iTrader: (2)

Yeah, oldschool guys sometimes are not familiar with "roller" technology. Roller lifters dont really wear. The way a flat tappet cam is ground and the way flat tappet lifters are ground dictate the need to have a special break in. Also, replacing lifters in a Gen III motor requires that you remove the heads, not the intake. They're obviously not up to date

White_Hawk

iTrader: (3)

Please tell me that your "OEM Engineer friends" work for Ford or Chrylser. That, I could understand.

-Geoff

2001CamaroGuy

iTrader: (6)

there is no need to change roller lifters UNLESS they are really old and/or you are going to put a valve spring that has too much pressure for the factory unit....

Mirek

Thanks fellas i feel 10X better about it.
IBTW I printed this thread and gave it to each of them. One came back and said that he did not know i had rollers & the other i have not heard back from yet.
AMEN to not having to change them i was kinda worried for a minute there !

robertbartsch

i changed my lifters with a H/C swap....it just made sence to me...

...nearly all that do a cam only swap leave the heads on ...this means you use the same lifters...the Gen 3 engine was designed to allow cam swaps without removing the head...previous engine designs generally require head removal to swap a cam...

MyLS1Hauls

iTrader: (2)

The Gen III motor is the only domestic V8 I've ever seen where you have to remove the heads to change lifters. SBCs, you need to remove the intake manifold to pull the lifters out, not the heads.

Tin Indian

"OEM Engineers"

I guess they work for that big Multi-National Corporation named "OEM Inc".

Or are these OEM Engineers working for one of the Big 3 auto manufacturers in Pro-E / CAD OEM production parts development?

Certainly, these so called "OEM Engineers" you speak of are not envolved in the "NASA Space Projects Research and Development Program" or maybe associated with the "Simulation of a Collisionless Time-of-Flight Mass Spectrometer Design for Upper Atmospheric Measurement of the Density & Velocity-Distributions of Neutral Particles"?

If so, they may have a very valid point... If not, I have a bad feeling you may be the victim of there bullshit.

Mirek

HeHe, easy there Star-Trek there is no such thing as "oem inc"...& yes the big three is VERY large & These guys really are pretty heavy hitters(obviously not the LS1 engineers)....they are just giving a heads up on the fundementals, and at the end of the day ya' should change your lifters despite the fact you do not HAVE to.If it were easier to do we would all be spending bucks on that too. Anyway ask me something about a Isuzu(gag me) transaxle an i'll be wrong BUT your average 16 year old tearing apart ls1 trans-ams in his parents driveway would probably have a more specific knowledge set then say the Isuzu production engineer on that(ls1)subject.

Tin Indian

Sorry about the bad humor..

However, unfortunatly, I'm not 16 myself

In fact, I am 55

Bottom line is: You really don't need to change out the lifters with a hyd roller cam. There is no wear pattern established like on a flat tappet cam.

Of course, if you feel better with it ... Feel free to purchase a set of those OEM lifters.

soundengineer

iTrader: (16)

If you wer doing a head swap on an ls1...then You might consider some new ones(engine Mileage dependent)...especially if you considered changing to a solid Roller Lifter vs a Hydraulic roller lifter.....but not at a cam swap....no need for most of our cars.......If you're doing heads...go for it at your own choice.

Mirek

HEHE no problem fellas... I deserved my ***** busted !
Thanks for giving me the strait poop -so to speak.
The dealer knows zero about my car....
The boys at work are obviously misinformed...
I've read where some vendors have steered folks wrong.....
God Bless the forum.
BTW RamAir346 should be over in like an hour for my cam swap...that dude is like rainman smart, i cant wait !

Old SStroker

Can you reveal the "OEM" these engineers call home? What exactly do they engineer?

No flame, but asking a radiologist about your ED problem rather than a urologist might get you different answers even though both are MDs. Engineers are also specialists.

Mirek

Exterior Componant engineers...but avid engine builders/off-roaders....DUDE i had that exact Oscar Wilde qoute in my last message and my puter crashed....then when i re-logged on and retyped my message i forgot to include it !

Old SStroker

Exterior stuff like OSRVM, bumper guards, wipers? Yeah, I did that at an OEM 35 years ago, but my heart was still in the engine department which was in the next office. Maybe things are arranged differently now, and EC engineers don't get into engine stuff.

Another quote I like: "With Age comes Wisdom. Sometimes Age shows up alone." --Anon.

'43 was a vintage year, IMO.