LS1TECH - Camaro and Firebird Forum Discussion

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

Lifter preload question

Thread Tools
 
Search this Thread
 
Old Jun 19, 2009 | 11:20 PM
Share
  #1  
Mike94ZLT1's Avatar
Mike94ZLT1
Thread Starter
TECH Fanatic
iTrader: (3)
 
Joined: Feb 2004
Posts: 1,455
Likes: 1
From: Livonia, Mi
Default Lifter preload question
I'm redoing my valvetrain, and I'm measuring out my pushrods. Following Vettenut's instructions I have determined that my car likes between 11 and 11.25 turns to get the rocker snug, so if I go off 11.125 turns I am right at 7.35625. How much preload should I add in? I'm going to try and run out and grab these pushrods in the morning. Thanks!
Reply
0
Old Jun 20, 2009 | 04:22 AM
Share
  #2  
DaddySS's Avatar
DaddySS
TECH Addict
 
Joined: Dec 2001
Posts: 2,907
Likes: 1
From: Bergen County, NJ
Default
.080 for stock lifters would put you at 7.43625 so the stock 7.4s will be a bit loose, 7.425s would be better, 7.450s would be nice and and quiet although some would say it is too much preload.
Reply
0
Old Jun 20, 2009 | 04:28 AM
Share
  #3  
PREDATOR-Z's Avatar
PREDATOR-Z
TECH Senior Member
 
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Default
What type lifters are you running?
Reply
0
Old Jun 20, 2009 | 07:47 AM
Share
  #4  
Mike94ZLT1's Avatar
Mike94ZLT1
Thread Starter
TECH Fanatic
iTrader: (3)
 
Joined: Feb 2004
Posts: 1,455
Likes: 1
From: Livonia, Mi
Default
Originally Posted by PREDATOR-Z
What type lifters are you running?
LS7 lifters. Sorry I didn't specify. Yella Terra rockers too.
Reply
0
Old Jun 20, 2009 | 08:10 AM
Share
  #5  
PREDATOR-Z's Avatar
PREDATOR-Z
TECH Senior Member
 
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Default
If your calculation is correct then 7.425s
Are you sure you measured on base lobe of cam with piston at TDC?
Reply
0
Old Jun 20, 2009 | 08:40 AM
Share
  #6  
Mike94ZLT1's Avatar
Mike94ZLT1
Thread Starter
TECH Fanatic
iTrader: (3)
 
Joined: Feb 2004
Posts: 1,455
Likes: 1
From: Livonia, Mi
Default
Originally Posted by PREDATOR-Z
If your calculation is correct then 7.425s
Are you sure you measured on base lobe of cam with piston at TDC?
Yes, on cylinder #2, the piston was at the top of the cylinder and both valves were closed. Will the 7.425's quiet it down some? A few of my lifters have collapsed or bled out when the engine was sitting and it only ran for a few seconds, so I know some of the noise was from that.
Reply
0
Old Jun 20, 2009 | 05:47 PM
Share
  #7  
Mike94ZLT1's Avatar
Mike94ZLT1
Thread Starter
TECH Fanatic
iTrader: (3)
 
Joined: Feb 2004
Posts: 1,455
Likes: 1
From: Livonia, Mi
Default
7.425's quieted it down quite a bit! Much quieter than it was with those trashed HS modded stockers!
Reply
0

Trending Topics

Old Jun 20, 2009 | 05:52 PM
Share
  #8  
PREDATOR-Z's Avatar
PREDATOR-Z
TECH Senior Member
 
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Default
Enjoy....
Reply
0
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

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

 Verdad Gallardo
story-1

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

 Pouria Savadkouei
story-2

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

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

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

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Jun 20, 2009 | 06:35 PM
Share
  #9  
Mike94ZLT1's Avatar
Mike94ZLT1
Thread Starter
TECH Fanatic
iTrader: (3)
 
Joined: Feb 2004
Posts: 1,455
Likes: 1
From: Livonia, Mi
Default
Originally Posted by PREDATOR-Z
Enjoy....
I will, thanks guys! I almost think I could get a 7.45 in there, but I don't feel like spending another $100 on it.
Reply
0
Old Jun 20, 2009 | 07:28 PM
Share
  #10  
Black Sunshine/ 00SS's Avatar
Black Sunshine/ 00SS
TECH Addict
iTrader: (1)
 
Joined: Nov 2001
Posts: 2,161
Likes: 0
From: Michigan
Default
Originally Posted by Mike94ZLT1
7.425's quieted it down quite a bit! Much quieter than it was with those trashed HS modded stockers!
Did you have some lifter issues that contributed to the valvetrain noise? Now that I've got a quieter exhaust on the car, I realize the valvetrain noise more.

I've been thinking of Morel lifters, and Yella Terras, whenever I have the motor freshened up in the future.
Reply
0
Old Jun 20, 2009 | 09:32 PM
Share
  #11  
Mike94ZLT1's Avatar
Mike94ZLT1
Thread Starter
TECH Fanatic
iTrader: (3)
 
Joined: Feb 2004
Posts: 1,455
Likes: 1
From: Livonia, Mi
Default
Originally Posted by Black Sunshine/ 00SS
Did you have some lifter issues that contributed to the valvetrain noise? Now that I've got a quieter exhaust on the car, I realize the valvetrain noise more.

I've been thinking of Morel lifters, and Yella Terras, whenever I have the motor freshened up in the future.
I think they just weren't pumped up all the way, and the slop in the valvetrain from the short pushrods made it worse. Sounds good now! Still kinda noisy but its to be expected!
Reply
0
Tags
Back to Subforum
Generation III Internal Engine
View Next Unread
LS1 / LS6 Intake need help




Advanced Search

All times are GMT -5. The time now is 11:11 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
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-3
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-4
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-5
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-6
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-7
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-8
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-9
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