When to upgrade lifters???

Reply Subscribe

Thread Tools

Search this Thread

Aug 6, 2006 | 03:56 PM

a98ws6

Thread Starter

TECH Addict

iTrader: (48)

Joined: Aug 2003

Posts: 2,272

Likes: 1

From: KCMO

When to upgrade lifters???

Building a forged 347 and I am going with a T-rex cam. When is it time to step up from stock lifters to aftermarket? Any recomendations?

Aug 6, 2006 | 06:04 PM

davered00ss

Moderator

iTrader: (4)

Joined: Nov 2003

Posts: 10,520

Likes: 0

From: Plainfield, CT

Get the Comp factory replacements. Basically when you do heads you should replace them.

Aug 6, 2006 | 07:02 PM

a98ws6

Thread Starter

TECH Addict

iTrader: (48)

Joined: Aug 2003

Posts: 2,272

Likes: 1

From: KCMO

Quote:

Originally Posted by davered00ss

Get the Comp factory replacements. Basically when you do heads you should replace them.

Are these the same as the Comp R's?

Aug 6, 2006 | 08:28 PM

GuitsBoy

TECH Senior Member

iTrader: (4)

Joined: Apr 2003

Posts: 6,249

Likes: 3

From: Long Island, NY

Quote:

Originally Posted by a98ws6

Are these the same as the Comp R's?

Nope.

Comp OE: 850's
Comp-R: 875's

Although plenty of people are running stock lifter on the Trex. If it were me, id either spring for the morel lifters, or stick with stock (even if you buy new stockers for piece of mind).

Aug 6, 2006 | 08:43 PM

Ferocity02

TECH Senior Member

iTrader: (60)

Joined: Apr 2003

Posts: 9,397

Likes: 4

Anyone have the part number for the stock GM lifters? Is it the same part number as the LS7 lifters?

Aug 6, 2006 | 08:47 PM

ShevrolayZ28

TECH Addict

iTrader: (4)

Joined: May 2005

Posts: 2,318

Likes: 1

From: Massachusetts

I decided to use Comp 850s. I installed them today. They were more beefy around the roller area than what came out.

The old ones looked OK as far as wear, but since I was replacing the heads, I thought what the hay.

Aug 6, 2006 | 08:48 PM

GuitsBoy

TECH Senior Member

iTrader: (4)

Joined: Apr 2003

Posts: 6,249

Likes: 3

From: Long Island, NY

Quote:

Originally Posted by Ferocity02

Anyone have the part number for the stock GM lifters? Is it the same part number as the LS7 lifters?

Same lifter.

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Verdad Gallardo

6 Common C5 Corvette Failures and What's Involved In Repairing Them

Pouria Savadkouei

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Verdad Gallardo

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Pouria Savadkouei

Top 10 Most Powerful Chevy Trucks Ever Made!

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Verdad Gallardo

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Verdad Gallardo

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Verdad Gallardo

10 Camaros You Should Never Buy

10 LS Engine Myths That Refuse to Die

Verdad Gallardo

Aug 6, 2006 | 10:40 PM

Ferocity02

TECH Senior Member

iTrader: (60)

Joined: Apr 2003

Posts: 9,397

Likes: 4

Quote:

Originally Posted by GuitsBoy

Same lifter.

Part number?

Aug 7, 2006 | 06:25 AM

#10

vettenuts

TECH Senior Member

iTrader: (4)

Joined: Jul 2004

Posts: 8,092

Likes: 13

From: Little Rhody

Based on my "non-scientific" research when the lifter load (max open times rocker ratio) load exceeds 625 lbs, the stock lifters become questionable.

Aug 7, 2006 | 08:01 AM

#11

GuitsBoy

TECH Senior Member

iTrader: (4)

Joined: Apr 2003

Posts: 6,249

Likes: 3

From: Long Island, NY

Quote:

Originally Posted by Ferocity02

Part number?

Not sure about a specific part number, but all hydraulic roller lifters used in GM v8 1987 through current are suposedly the same part. Furthemore with the exception of morel and comp, all GM and other branded lifters are made my one of two companies, Delphi and Eaton. IIRC, GM used the eaton style in the ls1 until 2000. From 2001 they used the delphi style. I prefer the earlier fully encapsulated eaton style. You can save yourself somecash by ordering either the summit branded hydraulic roller lifters, or you can order some melling lifters. I went with the melling lifters and theyre certainly the encapsulated eaton type. Allan futral even uses the inexpensive mellings in his big stroker motors, so they certainly hold up well.