zamboxl

iTrader: (1)

hey guys what lifters do you guys recomend that i could use with non adjustable rockers. I bought the pro magnums from comp, because of their better desing at higher rpms but it turns out that you gotta use them with adjustable rockers. So what lifters would you guys recomend, that could take a beating, and be good anywhere in the rpm range, from iddle all the way up to 6.5 k rpm

1999T/A

iTrader: (4)

Non - adjustable Rockers , use the normal comp replacement lifter

Adjustable rockers , use the Comp "R" Lifters

zamboxl

iTrader: (1)

yea but are they as the pro magnum r lifters.

edit::: actually does anybody know if part number 875-16 is the ones that need adjustable rockers? they are the pro magnums but i don't see any r on the box and i thought it was only the R's that needed adjustable rockers

hc_performance

iTrader: (4)

If i'm not mistaken the pro mags need adj. rockers too.

777

iTrader: (21)

i agree...

zamboxl

iTrader: (1)

o ok cool thanks

94form2000z

iTrader: (10)

My new stock lifters have been taking a beating just fine shifting at 6600 at one point.

zamboxl

iTrader: (1)

stock like gm stock, cause they not the best there is even a service bulleting out on them couse the ring inside is sopose to fail after a while or something like that. and stock lifters are not exactly design to have the best high rpm performance, i whent with the pro magnums cause they sopose to have a thicker ring or something inside that helps it retain oil better or something like that, which is better at higher rpms, i am not really sure how it all works but is something along those lines.

94form2000z

iTrader: (10)

Yes like stock as in bought new GM lifters. Never read about the bulletin and actually have rarely heard of any issues with stock lifters either.

mikey

iTrader: (6)

Use the Morel's. Don't even consider anything else. PM CStraub here or you can get them from Isky.

CLIFFRSRAMAIR

I've had 2 stock lifter fall apart with needle bearing all over the oil pan etc. If I remember correctly there is 32 bearing per rocker. Not fun, trying to find all of them.

zamboxl

iTrader: (1)

well dude iam am telling you this mechanic that i know when on the web log into the bulleting site or gm site or what ever and showed me the bulleting about the lifters failing for some reason

1999T/A

iTrader: (4)

I had a lifter fail , and another one on the way out when I took the motor apart . The one lifter exploded and I found chunks of it in the oil pan along with a TON of metal shavings and lifter needle bearings from the cam followers . I would NOT put GM lifters in my performance engine, but thats just me . ..

zamboxl

iTrader: (1)

PREDATOR-Z

Stock lifters are good till 6800 rpm with mild cams or .570 lifts or less. The proof is in the LS6.
Now when you near .600 lifts that is where Comp "R" come into play.

Stock rockers are some of the best if one an keep the bearings from braking apart. NASTY performance has a kit or does that with a Harland Sharp refurbishing kit (C-clips and new trunions. ~$260

02Reaper

iTrader: (2)

What about stock replacement lifters, such as crane, melling, regular comp, etc? What lift and rpm would you expect them to be good to?

Juiced346

I just got my lifters in the mail yesterday from LS1speed. I ordered the Comp Hi-Energy R lifters. As far as that I don't know? I dont have adjustable rockers and I was reccomended to get the R's.

Dane

1999T/A

iTrader: (4)

The lifter preload is different for the Comp Rs , you will now either have to get adjustable rockers or a custom length pushrod for correct preload . Of course the pushrods are cheaper , but I would rather do it right with the adjustable rockers . My .00000000000002 cents . . .

Juiced346

Never knew that. I am new to this.

Dane

PREDATOR-Z

With non adjustable rockers there is 2 ways to adjust lifter preload.
1- Custom length push rods (which is quasi impossible as every valve might require a different legth to achieve recomended lifter preload)
2- Shimming the rocker stands and that requires a shim kit which has all kinds of different size shims

Comp "R" lifters are recommended to use adjustable rockers to get the right amount of preload.

Crane, Comp Cam 850-16 and many "replacement" lifters meet or exceed OEM specifications.
I have Comp 850-16 and i spin to 6600 on 200 shot dry with no ill effects yet on my .581 XER lobes