Click here to visit LS1Tech
Click here to visit Performance Trucks
Click here to visit Mod Motor Tech
Click here to visit Modern Hemi

PerformanceTrucks.net Forums  

Go Back   PerformanceTrucks.net Forums > GENERAL MOTORS SPECIFIC FORUMS > GMT 900 Trucks General Discussion
Sign in using an external account
Register Forgot Password?

Welcome to Performance Trucks!
Welcome to Performance Trucks,

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
LinkBack Thread Tools Search this Thread
Old 03-24-2009, 11:02 PM   #1
Trader Rating: 3
TECH Enthusiast
 
On20Z's Avatar
 
Join Date: Dec 2005
Location: upstate,NY
Posts: 573
Default Anyone done heads on a 4.8/5.3l nnbs?

I am curious if anyone has done them.I am thinking of going with a tr220 cam,but didnt know if i should get the heads done as well or buy new ones that are already ported with new springs etc..Mine came with 243 casting but arent they detuned some way with smaller valves.I would like to run a stall too.What would you guys reccommend.Thanx peeps.
On20Z is offline   Reply With Quote
Old 03-29-2009, 12:22 PM   #2
Trader Rating: 0
TECH Apprentice
 
mikeith's Avatar
 
Join Date: Oct 2006
Location: lubbock, tx
Posts: 360
Default

EVERYTHING is the same as far as size specs on valves and everything. the only difference is that the valves arent sodium filled like the old z06 heads and all that was for was to handle higher rpms. your best best is to do a full port/polish/valve and MAYBE mill em down a bit if you're going to keep in n/a.
__________________
"If i had all the money I've ever spent on my trucks.... I'd spend it on my truck"
2010 CCSB white/black LT: 6.2, 3.42
Plans: KB turbo, vvt cam, circle d stall, trutrac, better brake setup, 3/5 drop(parts in garage), 22" tbss wheels(on waiting list), HD front end, Paint match everything.

2008 RCSB black/black LT1: Cammed w/ full bolt ons
SOLD
mikeith is offline   Reply With Quote
Old 03-29-2009, 08:42 PM   #3
Trader Rating: 2
Banned
 
Join Date: Jul 2008
Posts: 1,255
Default

what about l92 (ls9) heads ???
m3srt is offline   Reply With Quote
Old 03-29-2009, 10:21 PM   #4
Trader Rating: 3
TECH Fanatic
 
Ryan02SS's Avatar
 
Join Date: May 2003
Location: Lake Anna, VA/ Fairmont, WV
Posts: 1,795
Default

The L92 heads need at least a 4.000" bore to keep from smacking the valves into the bore. The 3.780" of the 5.3L will not work. The #243 and #799's are damn good flowing heads stock. The only way to get more power from them is have them ported, polished and larger valves installed.
__________________
2008 GMC Sierra 1500 4X4, Z71, Fire Red EC/RB "LY5" Gen IV 5.3L, 4L60E, AutoTrac, G80 locker, HD Trailering Package

Sadly Sold!!! 02 Silver SS #8774 H/C
420rwhp @ 396rwtq thru QTEC
12.4 @ 117 2.0 60 275 555R 3.42s 1300DA
Ryan02SS is offline   Reply With Quote
Old 03-30-2009, 01:14 AM   #5
Trader Rating: 2
Banned
 
Join Date: Jul 2008
Posts: 1,255
Default

Quote:
Originally Posted by Ryan02SS View Post
The L92 heads need at least a 4.000" bore to keep from smacking the valves into the bore. The 3.780" of the 5.3L will not work. The #243 and #799's are damn good flowing heads stock. The only way to get more power from them is have them ported, polished and larger valves installed.
how much does it cost to do a P&P on heads
m3srt is offline   Reply With Quote
Old 04-05-2009, 10:55 PM   #6
Trader Rating: 2
On The Tree
 
warrantykiller's Avatar
 
Join Date: Mar 2008
Location: Anderson,SC
Posts: 155
Default

how much do i need to have milled off my 243's to get a 4.8 to 11:1 compression? any help would be appreciated
__________________
07 SCSB W/T 4.8 , Forsa Flow exhaust, CAI, Helix T.B.S., Lowered 6"/8.5", 24" boss 330's, 3000 stall TCI, HPTuned, 150 Dry shot SOLD
2007 LTZ Suburban 3" lift for Sale
1999 SCSB lowered 4.8 sold
2003 Mini Cooper, 30 MPG
2003 SSS AWD Lowered on 24's cam headers powerdyne BD-11A, Meth, 3400 stall Revmax, built 4L65, waiting to install, L92 heads and LS3 intake. www.V8-muscle.net tune
1990 extended cab 350
warrantykiller is offline   Reply With Quote
Old 04-05-2009, 10:55 PM
PerformanceTrucks
Ford F150




Paid Advertisement
Reply

Tags
243, 243s, 53, cam, cost, gen, heads, iv, nnbs, patriot, polish, port, portpolish, sodium, valves, z06


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 On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 12:46 PM.

 



Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.

PerformanceTrucks.net and InternetBrands, Inc. are not affiliated with the Ford Motor Company