5.3l with 4.8l pistons - LS1TECH

Log In 


Generation III Internal Engine 1997-2006 LS1 | LS6
Sponsored by:
Sponsored by:

5.3l with 4.8l pistons

Reply
 
Thread Tools Search this Thread
Old 05-11-2010, 06:37 PM   #1
Staging Lane
Thread Starter
iTrader: (2)
 
70TWO NOVA's Avatar
 
Join Date: Oct 2007
Posts: 77
Default 5.3l with 4.8l pistons

Hey guys im building a 5.3 Lm7 and am installing flat top 4.8 pistons. Is there any need to balance the engine now since it will have new pistons?
70TWO NOVA is offline   Reply With Quote
Old 05-11-2010, 09:10 PM   #2
12 Second Club
iTrader: (49)
 
bww3588's Avatar
 
Join Date: Sep 2005
Location: Chillicothe/Lima, Ohio
Posts: 8,137
Default

how are you going to install 4.8 pistons? the CD is different, more than likely it will stick too far out of the hole.
bww3588 is offline   Reply With Quote
Old 05-11-2010, 09:12 PM   #3
Staging Lane
Thread Starter
iTrader: (2)
 
70TWO NOVA's Avatar
 
Join Date: Oct 2007
Posts: 77
Default

Quote:
Originally Posted by bww3588 View Post
how are you going to install 4.8 pistons? the CD is different, more than likely it will stick too far out of the hole.
it wont stick out the hole, they ar just flat tops as apposed to the dished 5.3 pistons. I just wasnt sure if it needed balancing since the piston weight would be different
70TWO NOVA is offline   Reply With Quote
Old 05-11-2010, 09:14 PM   #4
12 Second Club
iTrader: (49)
 
bww3588's Avatar
 
Join Date: Sep 2005
Location: Chillicothe/Lima, Ohio
Posts: 8,137
Default

.178 out of the hole to be exact.

4.8 pistons wont work.
bww3588 is offline   Reply With Quote
Old 05-11-2010, 09:16 PM   #5
12 Second Club
iTrader: (49)
 
bww3588's Avatar
 
Join Date: Sep 2005
Location: Chillicothe/Lima, Ohio
Posts: 8,137
Default

they will stick out of the hole. the compression depth is different for the shorter stroke of the 5.3

the compression depth of the 4.8 piston is 1.498 and the compression depth of the 5.3 piston is 1.328 ish.
bww3588 is offline   Reply With Quote
Old 05-11-2010, 09:16 PM   #6
Staging Lane
Thread Starter
iTrader: (2)
 
70TWO NOVA's Avatar
 
Join Date: Oct 2007
Posts: 77
Default

they do work, dont come out of the hole either

70TWO NOVA is offline   Reply With Quote
Old 05-11-2010, 09:19 PM   #7
Staging Lane
Thread Starter
iTrader: (2)
 
70TWO NOVA's Avatar
 
Join Date: Oct 2007
Posts: 77
Default

check out the build sheet on this thread...
http://www.pro-touring.com/forum/sho...ht=4.8+pistons
70TWO NOVA is offline   Reply With Quote
Old 05-11-2010, 09:23 PM   #8
12 Second Club
iTrader: (49)
 
bww3588's Avatar
 
Join Date: Sep 2005
Location: Chillicothe/Lima, Ohio
Posts: 8,137
Default

alrighty, i stand corrected. the rod length is different. search>me.

to address your balancing issue, i would have it balanced. but keep in mind stock engines are no where near 0 balance...i would still have it done just for peace of mind.
bww3588 is offline   Reply With Quote
Old 05-11-2010, 09:25 PM   #9
Staging Lane
Thread Starter
iTrader: (2)
 
70TWO NOVA's Avatar
 
Join Date: Oct 2007
Posts: 77
Default

Quote:
Originally Posted by bww3588 View Post
alrighty, i stand corrected. the rod length is different. search>me.

to address your balancing issue, i would have it balanced. but keep in mind stock engines are no where near 0 balance...i would still have it done just for peace of mind.
yeah i know the balance was not perfect from the factory, but i do know that the 5.3 pistons have a 7cc dish and that has to change the weight some from using flat tops now. Not sure if its enough to worry about though
70TWO NOVA is offline   Reply With Quote
Old 05-13-2010, 12:12 PM   #10
TECH Apprentice
iTrader: (2)
 
Join Date: Apr 2008
Location: L.A.
Posts: 356
Default

wow, i saw what i need to build in the garage for a couple hundo.. to a grand
ls1ya is offline   Reply With Quote
Old 05-13-2010, 05:45 PM   #11
TECH Enthusiast
iTrader: (35)
 
davidws6's Avatar
 
Join Date: Oct 2004
Location: Jax. FL.
Posts: 742
Default Pistons

70 two Nova, What pistons did you go with ?

I've searched for forged 4.8 pistons = nodda ?
davidws6 is offline   Reply With Quote
Old 05-13-2010, 05:46 PM   #12
Staging Lane
Thread Starter
iTrader: (2)
 
70TWO NOVA's Avatar
 
Join Date: Oct 2007
Posts: 77
Default

I bought a set from speed pro, h855cp
they arent forged though
70TWO NOVA is offline   Reply With Quote
Old 05-13-2010, 11:29 PM   #13
On The Tree
iTrader: (4)
 
vannatta20's Avatar
 
Join Date: Feb 2006
Posts: 142
Default

Try putting the 4.8 pistons on the drivers side then install the 5.3 pistons on the passenger side. This should balance well if my math is correct. Just make sure to mill the head with 5.3 pistons to even out the compression ratio.
vannatta20 is offline   Reply With Quote
Old 05-13-2010, 11:31 PM   #14
12 Second Club
iTrader: (49)
 
bww3588's Avatar
 
Join Date: Sep 2005
Location: Chillicothe/Lima, Ohio
Posts: 8,137
Default

Quote:
Originally Posted by vannatta20 View Post
Try putting the 4.8 pistons on the drivers side then install the 5.3 pistons on the passenger side. This should balance well if my math is correct. Just make sure to mill the head with 5.3 pistons to even out the compression ratio.
so 4 heavier pistons and 4 lighter pistons = balanced? what kind of math you doin boy?
bww3588 is offline   Reply With Quote
Old 05-14-2010, 12:01 AM   #15
Staging Lane
Thread Starter
iTrader: (2)
 
70TWO NOVA's Avatar
 
Join Date: Oct 2007
Posts: 77
Default

Quote:
Originally Posted by vannatta20 View Post
Try putting the 4.8 pistons on the drivers side then install the 5.3 pistons on the passenger side. This should balance well if my math is correct. Just make sure to mill the head with 5.3 pistons to even out the compression ratio.
aahhh why didnt I think of that!!!??? Mitch youre a genius! lol
70TWO NOVA is offline   Reply With Quote
Old 05-14-2010, 04:55 AM   #16
TECH Apprentice
iTrader: (2)
 
Join Date: Apr 2008
Location: L.A.
Posts: 356
Default

i've heard it all now, what next if i use the power ball/mother's wax on my heads i'll have a port /polish
ls1ya is offline   Reply With Quote
Old 05-14-2010, 08:12 AM   #17
On The Tree
iTrader: (4)
 
vannatta20's Avatar
 
Join Date: Feb 2006
Posts: 142
Default

just teasing my buddy
vannatta20 is offline   Reply With Quote
Old 05-15-2010, 12:55 AM   #18
Registered User
 
Join Date: May 2010
Posts: 18
Default

If anybody needs some stock 4.8 piston/rods I have a nice set of stockers from a donor motor I have. Make me an offer.
LSX92Stepside is offline   Reply With Quote
Old 05-15-2010, 07:58 AM   #19
Staging Lane
Thread Starter
iTrader: (2)
 
70TWO NOVA's Avatar
 
Join Date: Oct 2007
Posts: 77
Default

Quote:
Originally Posted by LSX92Stepside View Post
If anybody needs some stock 4.8 piston/rods I have a nice set of stockers from a donor motor I have. Make me an offer.
ahh now you tell me lol. I could have used those about 2 weeks ago... lol
70TWO NOVA is offline   Reply With Quote
Old 05-16-2010, 11:18 AM   #20
TECH Regular
iTrader: (6)
 
hcb1700's Avatar
 
Join Date: Oct 2007
Location: Oakland, California
Posts: 408
Default

Just saw this thread. What a great idea. I have a stock 5.3 LM7 sitting on the engine stand and this looks like a great thing to do. Looks like I'll be doing this when I'm ready to drop the engine in my '78 Z28.
hcb1700 is offline   Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
WTB: Gen IV 4.8 or 5.3 Pistons svslow Parts Wanted 0 06-01-2016 08:05 AM
5.3 to 4.8 rotating assembly? onesloGTO Generation III Internal Engine 6 06-15-2015 08:04 AM
WTB: 4.8l pistons jbeezy53 Parts Wanted 0 07-20-2014 11:49 PM
5.3l compression dreambird Generation III Internal Engine 6 02-16-2010 02:30 PM


Tags
378, 48, 48l, 53, 53l, bore, chevrolet, chevy, eagle, engine, forged, ls1, mount, pistons, stand

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 On
Refbacks are Off



All times are GMT -5. The time now is 10:09 PM.