MS4 and LS3 heads - PerformanceTrucks.net Forums



MS4 and LS3 heads

Reply
 
Thread Tools Search this Thread
Old 06-18-2011, 12:37 PM   #1
TECH Enthusiast
Thread Starter
iTrader: (5)
 
00buckshot's Avatar
 
Join Date: Mar 2010
Location: Reidsville, Ga
Posts: 622
Thanks: 0
Thanked 0 Times in 0 Posts
Default MS4 and LS3 heads

Guys, looking to run a ms4 or ms3 on an lq9 stock bottom end with ls3 heads, will there be enough ptv clearance with a factory gasket? has anyone tried this yet? will be a carbed motor in a light *** sn95 mustang.
00buckshot is offline   Reply With Quote
Old 06-18-2011, 02:43 PM   #2
11 Second Truck Club
iTrader: (5)
 
MPFD's Avatar
 
Join Date: Sep 2005
Location: Kansas
Posts: 1,339
Thanks: 0
Thanked 0 Times in 0 Posts
Default

No LS3 heads have valves that are so much larger that I am completely sure the MS4 won't work with out alot of fly cutting. and pretty confident the MS3 will need to be cut for also.
MPFD is offline   Reply With Quote
Old 06-19-2011, 01:05 PM   #3
TECH Enthusiast
Thread Starter
iTrader: (5)
 
00buckshot's Avatar
 
Join Date: Mar 2010
Location: Reidsville, Ga
Posts: 622
Thanks: 0
Thanked 0 Times in 0 Posts
Default

How much fly cutting would we be looking at? not scared of it at all, some fly cutting and a thicker gasket should do the trick
00buckshot is offline   Reply With Quote
Old 06-19-2011, 01:59 PM   #4
TECH Apprentice
iTrader: (7)
 
Camaro Zach's Avatar
 
Join Date: Dec 2004
Location: Alvin/Friendswood Texas
Posts: 374
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I am running a l92's, ms3, flat tops with small reliefs with no issues. planned on milling them .030 too without hesitating
Camaro Zach is offline   Reply With Quote
Old 06-20-2011, 07:11 AM   #5
TECH Enthusiast
Thread Starter
iTrader: (5)
 
00buckshot's Avatar
 
Join Date: Mar 2010
Location: Reidsville, Ga
Posts: 622
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Do the L92s have the same 2.16 intake valve as the LS3s do? if so, how much of a guestimate do you think woulkd need to be fly cut as the MS4 is .649 on the intake side. Thanks for the help guys
00buckshot is offline   Reply With Quote
Old 06-20-2011, 07:46 AM   #6
TECH Junkie
iTrader: (18)
 
Join Date: Feb 2007
Location: P.A. TX
Posts: 3,156
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by 00buckshot View Post
Do the L92s have the same 2.16 intake valve as the LS3s do? if so, how much of a guestimate do you think woulkd need to be fly cut as the MS4 is .649 on the intake side. Thanks for the help guys
yes the only difference in the 2 heads are the valve weight, id make sure id have the ls3 vales as they are lighter, anytime youre wanting to bring up the rpms for gains, its good to pay attention to valvetrain weight,the lighter the better, l92 valves are known to break.. if it matters i used to run the ls3 heads milled .015 with a .040 head gasket, on a lq9 this gave me a compression of 11:1. cam was a 235/239 .624 lift, i was border line on ptv clearance but the heads were setup with spring heights and spring pressure being dead on to what i am ( was ) looking for.. the exhaust side of the ls3 heads are whats important.. they definitely need a good porting

its not so much the lift as important to the duration!
skeet is offline   Reply With Quote
Old 06-20-2011, 09:55 AM   #7
TECH Enthusiast
Thread Starter
iTrader: (5)
 
00buckshot's Avatar
 
Join Date: Mar 2010
Location: Reidsville, Ga
Posts: 622
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Yes i do have the true LS3 lightweigth valves in these Skeet. does anyone know what is the max amount that CAN SAFELY be cut from the pistons?
00buckshot is offline   Reply With Quote
Old 06-29-2011, 11:23 AM   #8
LS1TECH & Trucks Sponsor
iTrader: (3)
 
Sales4@Texas-Speed's Avatar
 
Join Date: Jan 2007
Posts: 1,659
Thanks: 0
Thanked 0 Times in 0 Posts
Default

When we make flycuts we usually try to go around .080-.090" and no more just to make sure the piston stays strong enough. We have cut more then that in extreme cases and been alright but I would try and stay safe with it.
Sales4@Texas-Speed is offline   Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Ls3 swap into my 06 rcsb OHsixLS3 INTERNAL ENGINE MODIFICATIONS 14 12-27-2016 09:30 AM
thoughts on my forced induction cam TXsilverado FORCED INDUCTION 48 11-26-2015 10:54 AM
Finalizing build The_W GM Engine & Exhaust Performance 1 10-28-2015 09:00 PM
Is my fuel setup correct The_W FUEL SYSTEMS 4 08-15-2015 08:07 AM
Ls3 416ci fi short block swap Denali08 FORCED INDUCTION 12 08-09-2015 04:34 PM


Tags
60, bottom, cam, carbed, clearance, end, heads, lq4, lq9, ls3, milling, ms4, showroom, silverado, stock

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 04:31 PM.


 
  • Ask a Question
    Get answers from community experts
What's your question?
Send