ported 5.3 or LS3 heads on a stock LS2 shortblock?
01-31-2012, 06:21 PM
#1
ported 5.3 or LS3 heads on a stock LS2 shortblock? Trying to decide what to run on a stock 2006 LS2 GTO shortblock that I want to put a set of heads on.
1st set is some hand ported 5.3's with larger s/s valves and dual springs that flow a little more than 300cfm. They made 440rwhp/405rwtq with a 232/234 cam/LS6 intake on an M6 camaro. Approx 59cc
2nd set is from TSP ported LS3 heads with lightweight s/s valves and dual springs. 70cc and flow approx 350cfm
Is it a no brainer to use the LS3 heads and LS3 intake over the 5.3 heads/LS6 intake? The compression will be probably 1 point higher with the 5.3's.
Should I mill the LS3 heads to increase compression? What would compression be with them at 70cc?
1st set is some hand ported 5.3's with larger s/s valves and dual springs that flow a little more than 300cfm. They made 440rwhp/405rwtq with a 232/234 cam/LS6 intake on an M6 camaro. Approx 59cc
2nd set is from TSP ported LS3 heads with lightweight s/s valves and dual springs. 70cc and flow approx 350cfm
Is it a no brainer to use the LS3 heads and LS3 intake over the 5.3 heads/LS6 intake? The compression will be probably 1 point higher with the 5.3's.
Should I mill the LS3 heads to increase compression? What would compression be with them at 70cc?
01-31-2012, 09:52 PM
#2
ha ha.... I did a search for a while and found my own thread on this (which is the same) from June 2011!
https://ls1tech.com/forums/generatio...ls3-heads.html
So fast forward 7 months..... Should I stick with the LS3 heads?
https://ls1tech.com/forums/generatio...ls3-heads.html
So fast forward 7 months..... Should I stick with the LS3 heads?
01-31-2012, 11:20 PM
#5
TECH Regular
iTrader: (1)
Join Date: Aug 2007
Location: Lake Jackson TX, south of Houston
Posts: 480
Likes: 0
Received 0 Likes
on
0 Posts
5.3's ported, we did ls3s and it just dosn't pull off the line. the 5.3 will make more torq and get you moving. If you were going w more cubes like a 402, i would say the ls3's.
02-01-2012, 09:58 AM
#6
On a normal street car with ~3500 or more curb weight I would say the 5.3s with higher compression for increased torque down low.
But seeing how this is going to go (correct me if I'm wrong) in a sub 3000 curb weight car I say go for the higher flowing LS3s as you probably won't miss much of the low end torque on such a light car.
But seeing how this is going to go (correct me if I'm wrong) in a sub 3000 curb weight car I say go for the higher flowing LS3s as you probably won't miss much of the low end torque on such a light car.
Trending Topics
02-01-2012, 11:51 AM
#8
Be careful with the 5.3's on an LS2....your compression gets up there quick with them, especially after any milling! With the right cam selection, I think the LS3's would work very well on the LS2 short-block for you.
__________________
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
