HOME FORUM RULES CONTACT
     
   
   

Go Back   CLASS RACER FORUM > Class Racer Forums > Stock and Super Stock Tech


Reply
 
Thread Tools Display Modes
Old 02-23-2018, 07:31 PM   #1
Dragsinger
VIP Member
 
Join Date: Jul 2008
Location: Liberty City [East Texas]
Posts: 1,759
Likes: 5
Liked 98 Times in 59 Posts
Default Education, Chevrolet LS engine mechanical roller valve train

Racers,

Help me begin my education of the LS engines mechanical roller valve train.

Questions:

*considering the LS3/L92 rectangular-port head.What is required for valve springs and rockers to accommodate adjustable rockers and .750" range lift?

*This engine will spin in the 7800 RPM range and make around 700 horse. It will be carburated with a powerglide, dedicated, trailered, serious drag race package.

I am not interested in a non-adjustable, hydraulic valve train.
__________________
Larry Woodfin 471W
Dragsinger is offline   Reply With Quote
Old 02-24-2018, 03:30 AM   #2
Dragsinger
VIP Member
 
Join Date: Jul 2008
Location: Liberty City [East Texas]
Posts: 1,759
Likes: 5
Liked 98 Times in 59 Posts
Default Re: Education, Chevrolet LS engine mechanical roller valve t

For future reference, the LS series has many options and all the parts and modifications we are accustomed to with the generation 1 SBC are also available for the LS series. Mechanical, link bar roller lifters, adjustable & shaft rockers, valve springs to accommodate.750" lift. Also, Brodix, Dart, and GM offer a number of race head packages.
__________________
Larry Woodfin 471W
Dragsinger is offline   Reply With Quote
Old 02-25-2018, 11:16 AM   #3
rx dealer
Member
 
Join Date: Mar 2007
Location: Lake Orion, Michigan
Posts: 336
Likes: 9
Liked 53 Times in 13 Posts
Default Re: Education, Chevrolet LS engine mechanical roller valve t

The block must have the lifter bores bushed to help control the oil flow to the top of the valve train. If you don't you will flood the top end of the engine. The valve springs are critical. I went from having a "recommended" valve spring #860 open to a weaker valve spring that is #90 less. The heavy spring was making the valve to bounce after closing. I spent the extra money to put these parts on a spintron and that was my proof. Rocker shaft is a must ( Jesel / T&D ). Luke

Last edited by rx dealer; 02-25-2018 at 11:18 AM.
rx dealer is offline   Reply With Quote
Old 02-25-2018, 09:44 PM   #4
L79racer
Member
 
L79racer's Avatar
 
Join Date: Jan 2005
Location: North Massapequa, NY
Posts: 218
Likes: 0
Liked 0 Times in 0 Posts
Default Re: Education, Chevrolet LS engine mechanical roller valve t

Im running a LS3 based 418. Stock block and sleeves. Trick flow genx 255 heads by TEA. low lash solid roller by cam motion. morel lifters, jesel shaft rockers. pac 1238X springs, manton push rods. I have not bushed the lifter bores. Running a glide with it. Shifting 8000. Making over 700 hp.
L79racer is offline   Reply With Quote
Old 02-25-2018, 09:49 PM   #5
Dragsinger
VIP Member
 
Join Date: Jul 2008
Location: Liberty City [East Texas]
Posts: 1,759
Likes: 5
Liked 98 Times in 59 Posts
Default Re: Education, Chevrolet LS engine mechanical roller valve t

L79, you are in the area of what I have in mind. Thanks for the note
__________________
Larry Woodfin 471W
Dragsinger is offline   Reply With Quote
Old 02-26-2018, 02:59 PM   #6
JRyan
Senior Member
 
Join Date: Apr 2003
Location: Aberdeen SD
Posts: 641
Likes: 28
Liked 101 Times in 27 Posts
Default Re: Education, Chevrolet LS engine mechanical roller valve t

That's a pretty good street/strip set up that L79 racer is using. Should be very low maintenance a shouldn't break the budget. The LS platform is such a great platform to work with. Decent springs, good lifters and a nice cam profile they'll turn 7500 with stock rotating assembly's.

Rick
JRyan is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 12:26 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright © Class Racer.com. All Rights Reserved. Designated trademarks and brands are the property of their respective owners.