Is there any differences between the ls1 and ls6 head?
Thread Starter
Teching In
Joined: Jun 2003
Posts: 6
Likes: 0
From: Greenville, SC
Is there any differences between the ls1 and ls6 head? Is there any differences between the ls1 and ls6 head? I don't remember hearing any changes in the head when GM introduced the ls6. Are the castings the same?
TECH Junkie
Joined: Nov 2001
Posts: 3,604
Likes: 0
From: Los Angeles
Re: Is there any differences between the ls1 and ls6 head? Yes, they are different. No the castings are not the same. An LS6 will flow a fair amount more air than an LS1 head. A ported LS6 head will flow a tad more than a ported LS1 head. Depends on the porting work obviously. LS6 heads usually flow a lot better at higher lifts like .580+.
Re: Is there any differences between the ls1 and ls6 head? LS6 heads can theoretically flow like 320-330 cfm at higher lifts and you will typically see LS1 heads doing 290-310 cfm. Those are very very general ranges, since a bigger set of valves can add 10 cfm to a set of heads.
10 Second Club
Joined: Nov 2001
Posts: 1,724
Likes: 0
From: Fenton, MI
Re: Is there any differences between the ls1 and ls6 head? Yah, the LS6 heads are definitely better. When I ordered my MTI stage 2 heads, Jayson told me that the stage 2 LS6s would probably worth 10 hp over LS1 stage 2 heads on my heads/cam combo. He also told me that on a large displacement motor The LS6 heads have a larger advantage over the LS1 castings. When I ordered my heads a year and a half ago, I could not justify spending 1200 more dollars for 10 extra rwhp. But now, I wish I would have done it.
Jordan
Jordan
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
TECH Fanatic
Joined: Nov 2001
Posts: 1,975
Likes: 2
From: SW Florida
Re: Is there any differences between the ls1 and ls6 head? Below is some specs on both the 5.7 LS1 and LS6 heads. This info was posted by someone else here a while ago.
Casting Number 241
LS1 / 5.7L Passenger Car and Corvette
P/N 12559853 (97-00)
P/N 12564241 (01+)
Material: Aluminimum
Combustion Chamber Volume: 66.67cc
Compression Ratio: 10.1:1
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches
___________________________________________
Casting Number 243
LS6 / 5.7L "ZO6" Corvette
P/N 12564243
Material: Aluminimum
Combustion Chamber Volume: 64.45cc
Compression Ratio: 10.5:1
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches
As others have said, the exhaust port design is different between the heads. The LS6 has a "D" shaped exhaust port, while the LS1 does not. Bone stock, the LS6 will certainly flow better. Once fully ported and using the same size valves, I believe they both will flow about the same. Maybe just slightly better on the LS6 heads.
Ron,
Casting Number 241
LS1 / 5.7L Passenger Car and Corvette
P/N 12559853 (97-00)
P/N 12564241 (01+)
Material: Aluminimum
Combustion Chamber Volume: 66.67cc
Compression Ratio: 10.1:1
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches
___________________________________________
Casting Number 243
LS6 / 5.7L "ZO6" Corvette
P/N 12564243
Material: Aluminimum
Combustion Chamber Volume: 64.45cc
Compression Ratio: 10.5:1
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches
As others have said, the exhaust port design is different between the heads. The LS6 has a "D" shaped exhaust port, while the LS1 does not. Bone stock, the LS6 will certainly flow better. Once fully ported and using the same size valves, I believe they both will flow about the same. Maybe just slightly better on the LS6 heads.
Ron,
Re: Is there any differences between the ls1 and ls6 head? Tin Indian,
I am pretty sure that the intake and exhaust volums changed from 2000-2001/2 I am pretty sure in 01/02 they also went to 210cc I and 75cc E. the GM H/P mag I have states that any how but it would not be the first mistake a magazine has made? Just thought I'd throw my .02 in.
I am pretty sure that the intake and exhaust volums changed from 2000-2001/2 I am pretty sure in 01/02 they also went to 210cc I and 75cc E. the GM H/P mag I have states that any how but it would not be the first mistake a magazine has made? Just thought I'd throw my .02 in.
Re: Is there any differences between the ls1 and ls6 head? Everybody missed on of the most important differences:
The LS6 has a larger "short side" runner radius than the LS1. In effect, the air entering an LS1 combustion chamber makes a sharper turn from the intake port to the valve than with an LS6 head.
My fluid dynamics professor would call this "making the air angry" by forcing it around the tighter radius.
The LS6 has a larger "short side" runner radius than the LS1. In effect, the air entering an LS1 combustion chamber makes a sharper turn from the intake port to the valve than with an LS6 head.
My fluid dynamics professor would call this "making the air angry" by forcing it around the tighter radius.
