PerformanceTrucks.net Forums

GM Engine & Exhaust Performance EFI | GEN I/GEN II/GEN III/GEN IV Engines |Small Block | Big Block |

How Much Would 6L (317) Heads Lower the Compression on a 4.8L?

Thread Tools
 
Search this Thread
 
Old Dec 6, 2010 | 03:56 PM
  #1  
dug's Avatar
dug
Thread Starter
Banned
iTrader: (10)
 
Joined: Aug 2002
Posts: 3,727
Likes: 0
From: Phoenix
Default How Much Would 6L (317) Heads Lower the Compression on a 4.8L?
Just curious
Reply
0
Old Dec 6, 2010 | 04:02 PM
  #2  
dirt track racer 81's Avatar
dirt track racer 81
TECH Senior Member
iTrader: (45)
 
Joined: Jun 2005
Posts: 9,439
Likes: 13
From: Hennessey, Oklahoma
Default
some where around 8.5
Reply
0
Old Dec 6, 2010 | 04:09 PM
  #3  
Jon@Texas-Speed's Avatar
Jon@Texas-Speed
FormerVendor
iTrader: (18)
 
Joined: Sep 2004
Posts: 3,047
Likes: 0
From: Lubbock, TX
Default
Going from a 62 to a 72cc chamber will be a huge drop! What compression are you looking for?

Jon
Reply
0
Old Dec 6, 2010 | 09:18 PM
  #4  
silver-mod-o's Avatar
silver-mod-o
Hunt&Fisherator
iTrader: (15)
 
Joined: Nov 2005
Posts: 14,314
Likes: 17
From: SETx
Default
The valves will be shrouded with those heads on such a small bore...
Reply
0
Old Dec 6, 2010 | 10:33 PM
  #5  
dug's Avatar
dug
Thread Starter
Banned
iTrader: (10)
 
Joined: Aug 2002
Posts: 3,727
Likes: 0
From: Phoenix
Default
Like I said, Im just curious.

Theres a 6.71 supercharger kit available for LS engines. With the 4.8L pretty much being given away, I was thinking it could be a cheap alternative to small block chevy.

http://www.blowerdriveservice.com/
Reply
0
Old Dec 6, 2010 | 10:54 PM
  #6  
SLOXCAB's Avatar
SLOXCAB
TECH Addict
iTrader: (7)
 
Joined: May 2009
Posts: 2,680
Likes: 0
From: 1503
Default
bds is next to my house. good shop though ive never seen any of their ls stuff
Reply
0
Old Dec 7, 2010 | 08:18 AM
  #7  
silver-mod-o's Avatar
silver-mod-o
Hunt&Fisherator
iTrader: (15)
 
Joined: Nov 2005
Posts: 14,314
Likes: 17
From: SETx
Default
If I'm not mistaken it uses the same blower unit with a redesigned tub for the LS heads and fueling..
Reply
0

Trending Topics

Old Dec 7, 2010 | 09:44 AM
  #8  
trever1t's Avatar
trever1t
2nd fastest 5.3 ECSB
iTrader: (14)
 
Joined: Oct 2005
Posts: 26,690
Likes: 1
From: NorCal
Default
nothing looks like those old school blowers. I've seen a few BDS kits and they look amazing but I don't believe they offer the performance that modern Centrifugal, "modified roots" or Twin-screw blowers do.
Reply
0
Old Dec 7, 2010 | 02:00 PM
  #9  
dug's Avatar
dug
Thread Starter
Banned
iTrader: (10)
 
Joined: Aug 2002
Posts: 3,727
Likes: 0
From: Phoenix
Default
I agree. I was thinking more along the lines of an old skool ride. Something that looks cool and different. Dont need to be crazy fast.

Also, running on e85 would be interesting too
Reply
0
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
03 rcsb tubro 6.0,4l80 FS/FT
greedygenius
Trucks and SUV Classifieds
11
Sep 3, 2015 06:51 AM
Help with LQ4 swap in 91 Z71 RCSB
GrooveCityZ71
GM Engine & Exhaust Performance
7
Aug 31, 2015 12:05 PM
Gen IV 5.3 for boost
JordanH
GM Engine & Exhaust Performance
9
Aug 8, 2015 07:59 PM
A Little Disappointed
OLD BULL
INTERNAL ENGINE MODIFICATIONS
13
Aug 1, 2015 05:00 PM
LQ9 Bolt ons (ls6 heads?)
Aboss
GM Engine & Exhaust Performance
7
Jul 9, 2015 10:28 AM
Tags
Back to Subforum
GM Engine & Exhaust Performance
View Next Unread
Tranny dead, should I replace or rebuild?




Advanced Search

All times are GMT -5. The time now is 12:21 AM.