LS6 cam and 1.85 rockers
LS6 cam and 1.85 rockers 
04-16-2004, 05:06 PM
#4
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Question, If the LS6 heads can handle only up to .570 lift than how do stock LS1 heads handle over a .600 lift. My understanding it had to do with the valve springs, and not the heads?
04-16-2004, 07:51 PM
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I guess I don't know what I am talking about - Ok. The LS6 heads I have which come with the stock springs reads as follows:GEN 3 “CNC” Ported Cylinder Head Assembly (CNC Ported Option)
This is a CNC ported version of the 2002 LS6 cylinder head assembly. Capable of 500 horsepower, the intake runner volume is increased to 250cc while the exhaust is increased to 85cc. The cylinder head surface is planed to reduce the combustion chamber and increase the compression ratio to 11.2:1. Valves are ground for three angles, the valves are both hollow stem for reduced mass, and the exhaust valves are sodium filled for cooling. The valve springs are new for ‘2002 and are specked for .570” maximum lift. Note: Because this head is planed, the intake manifold pilot bosses must be chamfered.
Bill
This is a CNC ported version of the 2002 LS6 cylinder head assembly. Capable of 500 horsepower, the intake runner volume is increased to 250cc while the exhaust is increased to 85cc. The cylinder head surface is planed to reduce the combustion chamber and increase the compression ratio to 11.2:1. Valves are ground for three angles, the valves are both hollow stem for reduced mass, and the exhaust valves are sodium filled for cooling. The valve springs are new for ‘2002 and are specked for .570” maximum lift. Note: Because this head is planed, the intake manifold pilot bosses must be chamfered.
Bill
04-16-2004, 10:35 PM
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Originally Posted by Bill's 02 Z-28 SS
I guess I don't know what I am talking about - Ok. The LS6 heads I have which come with the stock springs reads as follows:GEN 3 “CNC” Ported Cylinder Head Assembly (CNC Ported Option)
This is a CNC ported version of the 2002 LS6 cylinder head assembly. Capable of 500 horsepower, the intake runner volume is increased to 250cc while the exhaust is increased to 85cc. The cylinder head surface is planed to reduce the combustion chamber and increase the compression ratio to 11.2:1. Valves are ground for three angles, the valves are both hollow stem for reduced mass, and the exhaust valves are sodium filled for cooling. The valve springs are new for ‘2002 and are specked for .570” maximum lift. Note: Because this head is planed, the intake manifold pilot bosses must be chamfered.
Bill
This is a CNC ported version of the 2002 LS6 cylinder head assembly. Capable of 500 horsepower, the intake runner volume is increased to 250cc while the exhaust is increased to 85cc. The cylinder head surface is planed to reduce the combustion chamber and increase the compression ratio to 11.2:1. Valves are ground for three angles, the valves are both hollow stem for reduced mass, and the exhaust valves are sodium filled for cooling. The valve springs are new for ‘2002 and are specked for .570” maximum lift. Note: Because this head is planed, the intake manifold pilot bosses must be chamfered.
Bill
Wasn't trying to dis you or anything. Just thought I would ask the question to get my information right.
04-17-2004, 12:17 AM
#7
Originally Posted by Bill's 02 Z-28 SS
I guess I don't know what I am talking about - Ok. The LS6 heads I have which come with the stock springs reads as follows:GEN 3 “CNC” Ported Cylinder Head Assembly (CNC Ported Option)
This is a CNC ported version of the 2002 LS6 cylinder head assembly. Capable of 500 horsepower, the intake runner volume is increased to 250cc while the exhaust is increased to 85cc. The cylinder head surface is planed to reduce the combustion chamber and increase the compression ratio to 11.2:1. Valves are ground for three angles, the valves are both hollow stem for reduced mass, and the exhaust valves are sodium filled for cooling. The valve springs are new for ‘2002 and are specked for .570” maximum lift. Note: Because this head is planed, the intake manifold pilot bosses must be chamfered.
Bill
This is a CNC ported version of the 2002 LS6 cylinder head assembly. Capable of 500 horsepower, the intake runner volume is increased to 250cc while the exhaust is increased to 85cc. The cylinder head surface is planed to reduce the combustion chamber and increase the compression ratio to 11.2:1. Valves are ground for three angles, the valves are both hollow stem for reduced mass, and the exhaust valves are sodium filled for cooling. The valve springs are new for ‘2002 and are specked for .570” maximum lift. Note: Because this head is planed, the intake manifold pilot bosses must be chamfered.
Bill
the heads have nothing to do with it, its the valve springs. get some 918's or duals and you can run just about any cam combo you want provided you dont colapse your lifters.
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04-17-2004, 07:51 AM
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Hi Guys,
I don't wish to make this an issue - the comment was made about stock LS6 heads with stock SPRINGS. I was just pointing out that the stock spring on a LS6 can't handle the lift - it needs some work - as it was pointed out. I agree with changing the springs, then the problem goes away.
Bill
I don't wish to make this an issue - the comment was made about stock LS6 heads with stock SPRINGS. I was just pointing out that the stock spring on a LS6 can't handle the lift - it needs some work - as it was pointed out. I agree with changing the springs, then the problem goes away.
Bill
