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

Help with Valve Adjustment

Thread Tools
 
Search this Thread
 
Old Nov 23, 2005 | 08:35 PM
  #1  
hotrodrx7's Avatar
Thread Starter
On The Tree
iTrader: (13)
 
Joined: Sep 2005
Posts: 111
Likes: 0
Default Help with Valve Adjustment

I decided to get adjustable rockers with my new cam set-up. I go through the 90 degree crank revolution routine and adjust all of the rockers and everything looks cool. Then I rotate the crank through another revolution, 90 degrees at a time to check everything out. A couple of rockers are loose to I tighten them up and do it again. Everytime I repeat this, a couple of more rockers have loosened up. What is happening? Are the lifters (stock) bleeding down with the spring preload? What should I do for the initial setting if this is normal?
Reply
Old Nov 23, 2005 | 08:48 PM
  #2  
Bryan@LME's Avatar
LS1TECH Sponsor
iTrader: (4)
 
Joined: Aug 2004
Posts: 301
Likes: 0
From: NW Houston
Default

The no fail way to set your valves is as follows:

When the exhaust starts to open set the intake. When the intake starts to close set the exhaust.

This will ensure that the lifter is on the base circle of the cam. Eighter set lash or preload at this time.

Do this for each cylinder.

This will work on any 4 stroke engine.
Reply
Old Nov 23, 2005 | 09:10 PM
  #3  
DaddySS's Avatar
TECH Addict
 
Joined: Dec 2001
Posts: 2,907
Likes: 1
From: Bergen County, NJ
Default

Originally Posted by hotrodrx7
I decided to get adjustable rockers with my new cam set-up. I go through the 90 degree crank revolution routine and adjust all of the rockers and everything looks cool. Then I rotate the crank through another revolution, 90 degrees at a time to check everything out. A couple of rockers are loose to I tighten them up and do it again. Everytime I repeat this, a couple of more rockers have loosened up. What is happening? Are the lifters (stock) bleeding down with the spring preload? What should I do for the initial setting if this is normal?
Don't the instructions say to wait between rotations and that it will take several cycles through the rotuine to get them adjusted?
Reply
Old Nov 23, 2005 | 09:32 PM
  #4  
hotrodrx7's Avatar
Thread Starter
On The Tree
iTrader: (13)
 
Joined: Sep 2005
Posts: 111
Likes: 0
Default

Worked like a charm. Thanks Bryan.
Reply
Old Nov 23, 2005 | 11:00 PM
  #5  
Beast96Z's Avatar
TECH Veteran
iTrader: (21)
 
Joined: Apr 2003
Posts: 4,049
Likes: 3
From: Shreveport, LA
Default

Originally Posted by Bryan@LME
The no fail way to set your valves is as follows:

When the exhaust starts to open set the intake. When the intake starts to close set the exhaust.

This will ensure that the lifter is on the base circle of the cam. Eighter set lash or preload at this time.

Do this for each cylinder.

This will work on any 4 stroke engine.
This is the way I was tought and it has never failed me.
Reply
Old Nov 24, 2005 | 07:35 AM
  #6  
vettenuts's Avatar
TECH Senior Member
iTrader: (4)
 
Joined: Jul 2004
Posts: 8,092
Likes: 13
From: Little Rhody
Default

What rockers are they?
Reply
Old Nov 24, 2005 | 11:47 AM
  #7  
Bryan@LME's Avatar
LS1TECH Sponsor
iTrader: (4)
 
Joined: Aug 2004
Posts: 301
Likes: 0
From: NW Houston
Default

Originally Posted by hotrodrx7
Worked like a charm. Thanks Bryan.
No problem man. This is one of the most commonly asked questions. There is no mystery to setting lash once you know the correct sequence.

Good luck,
Bryan
Reply
Old Nov 24, 2005 | 12:31 PM
  #8  
hotrodrx7's Avatar
Thread Starter
On The Tree
iTrader: (13)
 
Joined: Sep 2005
Posts: 111
Likes: 0
Default

Originally Posted by vettenuts
What rockers are they?

Harland Sharp 1.7 Adjustables (Thanks Gunnar)
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

6 Gifts Neither Your Dad Nor Grad Will Shove Into the 'Trinket Drawer'

 Brett Foote
story-1

Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

 Pouria Savadkouei
story-2

Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

 Verdad Gallardo
story-3

7 Most Reliable High-Performance Engines GM Has Ever Built

 Verdad Gallardo
story-4

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

 Verdad Gallardo
story-5

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

 Pouria Savadkouei
story-6

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

 Verdad Gallardo
story-7

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-8

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-9

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo




All times are GMT -5. The time now is 11:33 AM.

story-0
6 Gifts Neither Your Dad Nor Grad Will Shove Into the 'Trinket Drawer'

Don't get dad new socks or a grill brush this year.

By Brett Foote | 2026-06-09 14:55:56


VIEW MORE
story-1
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-05-28 11:05:11


VIEW MORE
story-2
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-3
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


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