LS1TECH - Camaro and Firebird Forum Discussion

Generation III Internal Engine 1997-2006 LS1 | LS6
Sponsored by:
Sponsored by:

Pushrod Pre-load Question

Thread Tools
 
Search this Thread
 
Old Apr 14, 2012 | 11:05 PM
Share
  #1  
Austinma62's Avatar
Austinma62
Thread Starter
TECH Enthusiast
 
Joined: Nov 2008
Posts: 525
Likes: 3
From: Saint Joseph, MO
Default Pushrod Pre-load Question
OK. So we checked the pre load on the 7.350 push rods from TSP with stage 2.5 LS6 heads milled .030. running the stock GM headgasket running .051 compressed thickness. And we came up with .090 preload. What preload is recommended? And what pre load is ran in stock form? The Comp cams manual recommends between .020-.040 preload. What do you guys think?
Reply
0
Old Apr 14, 2012 | 11:24 PM
Share
  #2  
ZeeOSix's Avatar
ZeeOSix
TECH Regular
 
Joined: Jul 2011
Posts: 452
Likes: 2
Default
Originally Posted by Austinma62
The Comp cams manual recommends between .020-.040 preload. What do you guys think?
You running Comp Cams lifters? I'm assuming the Comps Cam recommendation is just for their lifters (?).
Reply
0
Old Apr 14, 2012 | 11:24 PM
Share
  #3  
Austinma62's Avatar
Austinma62
Thread Starter
TECH Enthusiast
 
Joined: Nov 2008
Posts: 525
Likes: 3
From: Saint Joseph, MO
Default
Im using LS7 lifters and the stock rockers were torquer down to 22 ft lbs.
Reply
0
Old Apr 14, 2012 | 11:36 PM
Share
  #4  
ZeeOSix's Avatar
ZeeOSix
TECH Regular
 
Joined: Jul 2011
Posts: 452
Likes: 2
Default
Originally Posted by Austinma62
Im using LS7 lifters and the stock rockers were torquer down to 22 ft lbs.
When Comp Cams recommends 0.020 to 0.040" pre-load, are they saying for any lifter?

Lifter plunger travel differs between lifters. The LS7 lifters have around 0.170" of travel per the attached chart below, so IMO your 0.090" pre-load isn't far off. Someone here actually measured the LS7 plunger travel and got somewhere around 0.200" if I recall correctly.
Attached Thumbnails Pushrod Pre-load Question-lsx-lifter-preload.jpg  
Reply
0
Old Apr 15, 2012 | 12:10 AM
Share
  #5  
outkast6991's Avatar
outkast6991
TECH Fanatic
iTrader: (34)
 
Joined: Jun 2004
Posts: 1,625
Likes: 0
From: lancaster,pa
Default
I'm running .025 on my ls7's
Reply
0
Old Apr 15, 2012 | 05:18 PM
Share
  #6  
Austinma62's Avatar
Austinma62
Thread Starter
TECH Enthusiast
 
Joined: Nov 2008
Posts: 525
Likes: 3
From: Saint Joseph, MO
Default
I'm confused with that chart. I looked at my ls7 part number and it doesn't match any of those.
Reply
0
Old Apr 15, 2012 | 05:28 PM
Share
  #7  
ZeeOSix's Avatar
ZeeOSix
TECH Regular
 
Joined: Jul 2011
Posts: 452
Likes: 2
Default
Originally Posted by Austinma62
I'm confused with that chart. I looked at my ls7 part number and it doesn't match any of those.
What part number do you have?
Reply
0

Trending Topics

Old Apr 15, 2012 | 05:54 PM
Share
  #8  
dodson55's Avatar
dodson55
10 Second Club
iTrader: (18)
 
Joined: Nov 2010
Posts: 490
Likes: 1
From: monticello, ky
Default
i think ideal is around .045 to .060 i am running .090 on mine and it does fine
Reply
0
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

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

 Verdad Gallardo
story-1

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-2

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-3

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-4

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

 Verdad Gallardo
story-5

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-6

10 Camaros You Should Never Buy

 
story-7

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
story-8

Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0

 Brett Foote
story-9

10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever

 Verdad Gallardo
Old Apr 15, 2012 | 06:23 PM
Share
  #9  
Austinma62's Avatar
Austinma62
Thread Starter
TECH Enthusiast
 
Joined: Nov 2008
Posts: 525
Likes: 3
From: Saint Joseph, MO
Default
28-12499225 GM ls7 lifter kit
Reply
0
Old Apr 17, 2012 | 02:44 PM
Share
  #10  
Austinma62's Avatar
Austinma62
Thread Starter
TECH Enthusiast
 
Joined: Nov 2008
Posts: 525
Likes: 3
From: Saint Joseph, MO
Default
Originally Posted by dodson55
i think ideal is around .045 to .060 i am running .090 on mine and it does fine
your running ls7 lifters also?
Reply
0
Old Apr 17, 2012 | 02:52 PM
Share
  #11  
joecar's Avatar
joecar
TECH Senior Member
20 Year Member
Photogenic
Photoriffic
Shutterbug
 
Joined: Apr 2002
Posts: 6,080
Likes: 17
From: So.Cal.
Default
12499225 is the part number for the kit of 16 x 17122490 lifters (i.e. the last row of the chart posted above by ZeeOSix).
Reply
0
Old Apr 17, 2012 | 05:52 PM
Share
  #12  
Austinma62's Avatar
Austinma62
Thread Starter
TECH Enthusiast
 
Joined: Nov 2008
Posts: 525
Likes: 3
From: Saint Joseph, MO
Default
Originally Posted by joecar
12499225 is the part number for the kit of 16 x 17122490 lifters (i.e. the last row of the chart posted above by ZeeOSix).
Ok, so your saying the .082 preload would be ideal for the LS7 lifters?
Reply
0
Tags
Back to Subforum
Generation III Internal Engine
View Next Unread
What are these?




Advanced Search

All times are GMT -5. The time now is 04:56 AM.

story-0
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-1
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-2
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-3
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-4
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-5
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-6
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-7
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE
story-8
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0

The world was a better place when it was still around.

By Brett Foote | 2026-01-23 09:20:37


VIEW MORE
story-9
10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever

Slideshow: The 7.0-liter LS7 was designed for absolute cutting-edge performance.

By Verdad Gallardo | 2026-01-07 18:36:00


VIEW MORE