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

LS3 pistons in L92 with VVT

Thread Tools
 
Search this Thread
 
Old Aug 17, 2021 | 03:32 PM
  #1  
93M6Formula's Avatar
Thread Starter
TECH Fanatic
 
Joined: Aug 2008
Posts: 1,740
Likes: 2
From: Nebraska
Default LS3 pistons in L92 with VVT

Alright i'm hoping someone can shed light on this for me. Longstory short, I want to put LS3 pistons in my L92, is there any reason this can't be done while retaining VVT? Was this the purpose for the valve reliefs on L92 pistons?
Reply
Old Aug 17, 2021 | 04:19 PM
  #2  
Jimbo1367's Avatar
TECH Senior Member
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Jul 2009
Posts: 8,034
Likes: 663
Default

I would imagine they are needed with stock cam specs.
Reply
Old Aug 17, 2021 | 04:25 PM
  #3  
93M6Formula's Avatar
Thread Starter
TECH Fanatic
 
Joined: Aug 2008
Posts: 1,740
Likes: 2
From: Nebraska
Default

Originally Posted by Jimbo1367
I would imagine they are needed with stock cam specs.
That's why i'm not sure because the LS3 cam is bigger, so that shouldn't be an issue, I just don't know if the VVT function requires those valve reliefs.
Reply
Old Aug 17, 2021 | 04:49 PM
  #4  
G Atsma's Avatar
TECH Senior Member
5 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2016
Posts: 22,303
Likes: 3,619
From: Central Cal.
Default

VVT advances the cam a good bit at low speeds, which might be the reason why the reliefs are needed
Reply
Old Aug 18, 2021 | 07:50 AM
  #5  
KCS's Avatar
KCS
Moderator
20 Year Member
Liked
Loved
Community Favorite
iTrader: (20)
 
Joined: Mar 2005
Posts: 8,859
Likes: 323
From: Conroe, TX
Default

Originally Posted by 93M6Formula
Alright i'm hoping someone can shed light on this for me. Longstory short, I want to put LS3 pistons in my L92, is there any reason this can't be done while retaining VVT? Was this the purpose for the valve reliefs on L92 pistons?
Yes, that is why the pistons have valve reliefs. The VVT phaser has between 52 and 62 degrees of rotation, depending on the phaser, which will have a HUGE effect on PTV.
Reply
Old Aug 18, 2021 | 12:23 PM
  #6  
DavidBoren's Avatar
TECH Addict
 
Joined: Jul 2013
Posts: 2,189
Likes: 123
From: Portland, Oregon
Default

The L92 cam is pretty mild... I wouldn't be surprised if you could get away with flat-tops and not run into any PTV issues... I would still probably punch some numbers into a PTV calculator with the cam at full retard, straight up, and full advance... that should give you a pretty good idea of what you're working with. KCS has forgotten more than I will ever know, so definitely take anything I say with a grain of salt.

I like the L92 cam, actually, and would like to see what it can do in a 4.8/5.3 with some 1.85 rockers... assuming that somehow doesn't make a valve clip the block... but I highly doubt that would be the case with 198/209 .545/.545 115(?) cam, regardless of where it may be in its VVT phasing.
Reply




All times are GMT -5. The time now is 11:17 AM.

story-0
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-1
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-2
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-3
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-4
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-5
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-6
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-7
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-8
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-9
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