LS3 Intake Valve Stem length/height? - LS1TECH - Camaro and Firebird Forum Discussion

Notices
Generation IV Internal Engine 2005-2014 LS2 | LS3 | LS7 | L92 | LS9

LS3 Intake Valve Stem length/height?

Old 11-05-2016, 08:48 PM
  #1  
TECH Fanatic
Thread Starter
 
Join Date: Jan 2015
Location: Fort Worth, Texas
Posts: 1,079
Default LS3 Intake Valve Stem length/height?

I'm building a L92 out of a 2007 Escalade for my Camaro.

I bought hollow LS3 Intake Valves to replace the solid L92 ones per the advise on this site, I got caught up with installing the Springs.....Measuring Installed height etc etc. & didn't notice that the Intake Stems are taller than the Exhaust Stems by about .020" until the heads were torqued down.

My PAC Springs came with an extra keeper/lock, With it on an original L92 Intake valve......Sure enough, The LS3 Valve is .020" taller from the Keeper Groove to the Tip.
I put a straight edge across a junk L92 head & all the Stems are the same height.

I was pretty confused at this point, So I took a Valve Cover & Rockers off a 2013 LS3 with 0821 heads & the Intake Valves are also .020" taller.......

WTF?? What do I do here? I know this will throw off lifter preload, Is it common to run 2 different length pushrods on a LS3??

Pic of the stock LS3.....
Name:  IMG_0070_zpsmlwfigpt.jpg
Views: 812
Size:  220.4 KB
clinebarger is offline  
Old 11-06-2016, 11:17 AM
  #2  
KCS
Moderator
iTrader: (19)
 
KCS's Avatar
 
Join Date: Mar 2005
Location: Conroe, TX
Posts: 8,190
Default

It's fine. The LS6 hollow stems are like that too. It's not going to throw off the lifter preload enough to matter either.
KCS is online now  
Old 11-06-2016, 11:22 AM
  #3  
TECH Fanatic
 
Join Date: Jul 2013
Location: Portland, Oregon
Posts: 1,804
Default

Unless you are running short travel lifters, the plunger should take up the difference without ill-effect.
DavidBoren is offline  
Old 11-07-2016, 11:10 AM
  #4  
TECH Fanatic
 
MuhThugga's Avatar
 
Join Date: Jul 2007
Location: Wilmington, De
Posts: 1,260
Default

Yep. Measure for pushrod length and run it.
MuhThugga is offline  
Old 01-05-2019, 07:52 PM
  #5  
TECH Apprentice
 
dawgs74's Avatar
 
Join Date: Nov 2017
Location: Antioch ca
Posts: 348
Default

The stock ls3 pics should tell you something. ...I think your heads are fine and your sweatin over nuthin'......I noticed the same thing when I built my first ls....ran with the original pushrods on an asa cam with no issues. ...but yea when I noticed the valvestem heights too I was concerned but upon more research I found it to be normal and ran with it.....don't fry your brain trying to figure these engines out....they are quite simple! !!
dawgs74 is offline  
Old 01-05-2019, 07:53 PM
  #6  
TECH Apprentice
 
dawgs74's Avatar
 
Join Date: Nov 2017
Location: Antioch ca
Posts: 348
Default

I don't care if this is 3yrs old btw....
dawgs74 is offline  
Old 01-05-2019, 08:24 PM
  #7  
KCS
Moderator
iTrader: (19)
 
KCS's Avatar
 
Join Date: Mar 2005
Location: Conroe, TX
Posts: 8,190
Default

Originally Posted by dawgs74 View Post
I don't care if I look dumb replying to a 3yrs old thread btw....
Fixed.
KCS is online now  
Old 01-05-2019, 09:29 PM
  #8  
TECH Addict
iTrader: (3)
 
Join Date: Aug 2013
Location: Iowa
Posts: 2,175
Default

Originally Posted by KCS View Post

Fixed.
Better late than never....in some cases...maybe not this one!
LLLosingit is online now  
Old 01-06-2019, 12:39 AM
  #9  
TECH Apprentice
 
dawgs74's Avatar
 
Join Date: Nov 2017
Location: Antioch ca
Posts: 348
Default

We can already see the butt hurt people .....nothing better to do than monitor the dates of stuff and get there panties in a bunch!!!!!...can't we all just get along
dawgs74 is offline  
Old 01-06-2019, 12:41 AM
  #10  
TECH Apprentice
 
dawgs74's Avatar
 
Join Date: Nov 2017
Location: Antioch ca
Posts: 348
Default

Originally Posted by KCS View Post

Fixed.
this was never quoted on this thread....you copied and dragged this from your butthole
dawgs74 is offline  
Old 01-06-2019, 03:55 AM
  #11  
TECH Addict
iTrader: (3)
 
Join Date: Aug 2013
Location: Iowa
Posts: 2,175
Default

Originally Posted by dawgs74 View Post
We can already see the butt hurt people
I only see one, It is funny to see someone answer a persons tech question that was most likely resolved years ago... It's kind of like a guy saying hey if I jump out of this building tomorrow will I die.... What's the point of answering the day after he jumped?
LLLosingit is online now  


Thread Tools
Search this Thread
Quick Reply: LS3 Intake Valve Stem length/height?


About Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: