Milling 799s on 5.3 - LS1TECH - Camaro and Firebird Forum Discussion

Notices
Forced Induction Superchargers | Turbochargers | Intercoolers

Milling 799s on 5.3

Reply

Old 12-20-2017, 03:21 PM
  #1  
Staging Lane
Thread Starter
iTrader: (2)
 
Join Date: Mar 2005
Location: FL
Posts: 69
Default Milling 799s on 5.3

Hey everyone,
So I am in the process of rebuilding my 5.3 LM7 for force induction with a HSP Billet 7875 turbo. The engine came with dish pistons and stock 706 heads. I just sold the 706 heads and dish pistons and picked up a set of 799 heads and flat top pistons from a L33 5.3 at the junkyard. My current process for this build will also include BTR dual valve springs, BTR Turbo Stage II cam, LS7 lifters, BTR push rods, new timing chain, and LS9 heads gaskets. With all the info listed above for my setup will I have to mill the 799 heads or will I be good to go to just leave them alone. Thanks for all the help and Happy Holidays.

Last edited by SLWRDE; 12-20-2017 at 05:29 PM.
SLWRDE is offline  
Reply With Quote
Old 12-20-2017, 05:48 PM
  #2  
Restricted User
 
Join Date: Mar 2014
Location: Ohio
Posts: 6,102
Default

Compression is 9.9:1 with 799s and flat tops. Not sure how much higher you want it to be...
JoeNova is online now  
Reply With Quote
Old 12-20-2017, 06:52 PM
  #3  
Staging Lane
Thread Starter
iTrader: (2)
 
Join Date: Mar 2005
Location: FL
Posts: 69
Default

Thanks Joe for all the info. I am assuming after doing a lot of reading that the only need to mill the heads would be if you are keeping the dish pistons in the engine. Is that correct? Also would I still maintain the 9.9:1 with the LS9 head gaskets or would you recommend something else. Thanks for all the help.
SLWRDE is offline  
Reply With Quote
Old 12-20-2017, 08:19 PM
  #4  
Restricted User
 
Join Date: Mar 2014
Location: Ohio
Posts: 6,102
Default

As long as you keep compression below 10:1 for pump gas and boost, you're good to go. LS9 head gaskets will drop compression very slightly. 5.3 with flat tops, 799s, and LS9 head gaskets is a popular combo.
JoeNova is online now  
Reply With Quote
Old 12-21-2017, 12:12 AM
  #5  
Staging Lane
Thread Starter
iTrader: (2)
 
Join Date: Mar 2005
Location: FL
Posts: 69
Default

With the flat top pistons I have(no valve relief) and the cam I am using on this setup, BTR Turbo Stage II 226/231 .605"/.598" 113+4, will I need to be concerned with piston to valve clearance? Thanks

Last edited by SLWRDE; 12-21-2017 at 12:54 AM.
SLWRDE is offline  
Reply With Quote
Old 12-22-2017, 01:33 PM
  #6  
8 Second Club
iTrader: (2)
 
RonSSNova's Avatar
 
Join Date: Aug 2011
Location: Portland, OR
Posts: 2,922
Default

Originally Posted by SLWRDE View Post
With the flat top pistons I have(no valve relief) and the cam I am using on this setup, BTR Turbo Stage II 226/231 .605"/.598" 113+4, will I need to be concerned with piston to valve clearance? Thanks
Probably not, but check it to be safe.Curious why you didnít just grab the complete L33?
RonSSNova is offline  
Reply With Quote
Old 12-25-2017, 05:41 PM
  #7  
Staging Lane
Thread Starter
iTrader: (2)
 
Join Date: Mar 2005
Location: FL
Posts: 69
Default

The junkyard wanted way too much for the engine.
SLWRDE is offline  
Reply With Quote

Thread Tools
Search this Thread
Quick Reply: Milling 799s on 5.3


Archive Advertising Cookie Policy Privacy Statement Terms of Service

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: