Cylinder head advice
Thread Starter
Racer
Joined: Jun 2009
Posts: 374
Likes: 0
From: Houston Texas
Cylinder head advice
I am thinking of upgrading my ls2 to the ls3 heads and intake. Does anyone know how much hp gains I should expect to see, also can i use my stock injectors and throttle body with this setup?
Safety Car
Joined: Jun 1999
Posts: 3,570
Likes: 3
From: Austin, Singapore, Kuala Lumpur, Houston, Dallas, Hong Kong, Elgin, etc.. Texas
There is a lot of info on this swap. Have you done a search here and on the other LS1 forums?
Thread Starter
Racer
Joined: Jun 2009
Posts: 374
Likes: 0
From: Houston Texas
Former Vendor
Joined: Apr 2006
Posts: 2,470
Likes: 2
From: Portland OR
St. Jude Donor '10-'11-'12
Its hard to pinpoint an exact gain. You should see a gain but my guess is that without changing cams it will be minimal... unless you already have a performance cam in there?
Porting the LS3 intake doesnt hurt either.
Porting the LS3 intake doesnt hurt either.
Drifting
Joined: Oct 2004
Posts: 1,790
Likes: 29
From: STL MO
St. Jude Donor '09-'10
My question regarding the Op's inquiry has always been is it worth it to go this route or to consider doing some as cast Trick Flow 220's and a 102 FAST (assuming a larger than stock cam is already in place or part of the equation)
Former Vendor
Joined: Apr 2006
Posts: 2,470
Likes: 2
From: Portland OR
St. Jude Donor '10-'11-'12
Its really hard to say. The OEM heads have caught up with the aftermarket in some cases.
Research is your best friend, look for examples of what your thinking about doing and compare results. My guess is the 220 is better than the oem but when you add total budget of ls3 intake and head vs TFS and FAST how much more power are we talking about making over the other?.
so All I can say is do some research and look for results of people who have similar combinations of what your looking to do.
For the OP what heads do you have now? what are the casting numbers? Cam swap? stock LS2 not a 402?
There are some really good results with ported LS3/L92 heads, I didn't really look for anyone doing a swap for stock castings but here is some quick info I found:
GM's new LS3 head represents a phenomenal leap in capacity over previous cathedral port castings. In as-cast form this head moves only 313cfm at a whopping 260cc port volume.
Research is your best friend, look for examples of what your thinking about doing and compare results. My guess is the 220 is better than the oem but when you add total budget of ls3 intake and head vs TFS and FAST how much more power are we talking about making over the other?.
so All I can say is do some research and look for results of people who have similar combinations of what your looking to do.
For the OP what heads do you have now? what are the casting numbers? Cam swap? stock LS2 not a 402?
There are some really good results with ported LS3/L92 heads, I didn't really look for anyone doing a swap for stock castings but here is some quick info I found:
GM's new LS3 head represents a phenomenal leap in capacity over previous cathedral port castings. In as-cast form this head moves only 313cfm at a whopping 260cc port volume.
Last edited by 99blancoss; Apr 23, 2010 at 12:39 PM. Reason: added content
Thread Starter
Racer
Joined: Jun 2009
Posts: 374
Likes: 0
From: Houston Texas
I have a stock ls2 long block. I am just looking into cost effective options. I noticed that the intake valves in the ls3 heads are quite abit larger than my 243 ls2 heads. I'm not really looking to build a 10 sec thumper, just alittle more. I already have added headers catted x, varram, tbs, cow tune.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Racer
Joined: Jun 2009
Posts: 374
Likes: 0
From: Houston Texas
Former Vendor
Joined: Apr 2006
Posts: 2,470
Likes: 2
From: Portland OR
St. Jude Donor '10-'11-'12
Fits any LS family engine with 4" bore or bigger.
Flows 316 cfm on a 4" bore. SO there is power to be made
The stock LS2 flows 260.
Cant say what would see straight across but it could actually be decent looking at the numbers now. A search for some numbers from a LS2 with some stock L92s or LS3's is what you should do.
Flows 316 cfm on a 4" bore. SO there is power to be made
The stock LS2 flows 260.
Cant say what would see straight across but it could actually be decent looking at the numbers now. A search for some numbers from a LS2 with some stock L92s or LS3's is what you should do.
