The Head's are Off and!!!!!
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From: Kennesaw, Georgia
The Head's are Off and!!!!! 4 out of the 8 cylinder's was pushing water?? 2 on each side of the engine.
Either my tune is way off or the head's are not up to the task. I am only at 12lbs of boost also, but I did notice some detonation when I was in myrtle beach. I am sure that isn't helping either.So I guess I will try oringing them first and go from there. I will think about for a couple of day's? I still may go with a different head? I did notice that the head stud's did not seem to be real tight.I never did a retorque since the motor was new, so maybe that was part of the problem.
Either my tune is way off or the head's are not up to the task. I am only at 12lbs of boost also, but I did notice some detonation when I was in myrtle beach. I am sure that isn't helping either.So I guess I will try oringing them first and go from there. I will think about for a couple of day's? I still may go with a different head? I did notice that the head stud's did not seem to be real tight.I never did a retorque since the motor was new, so maybe that was part of the problem.
Detonation = HUGE pressure spikes. If you actually *heard* the detonation vs seeing it on a scanner it's really bad detonation and means that you are detonating more often than you can tell by ear.
On my car I can't hear any detonation, but the scanner picks it up. Anything over 2 degrees of retard or if the detonation is persistant and I let off the throttle. I pull massive timing at the onset of detonation. Once detonation starts it's VERY difficult to stop it unless you cut the fuel supply. Even if i'm not looking at the scan gage I can usually tell it detonated by the way the car feels due to the amount of timing pulled. I run double the factory attack rate and allow a max of 10 degrees to be pulled.
On my car I can't hear any detonation, but the scanner picks it up. Anything over 2 degrees of retard or if the detonation is persistant and I let off the throttle. I pull massive timing at the onset of detonation. Once detonation starts it's VERY difficult to stop it unless you cut the fuel supply. Even if i'm not looking at the scan gage I can usually tell it detonated by the way the car feels due to the amount of timing pulled. I run double the factory attack rate and allow a max of 10 degrees to be pulled.
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From: Kennesaw, Georgia
The detanation was in the higher rpm's and I did get out of it. I was thinking that it maybe was bad gas from myrtle beach. I am not sure about the tune or timing,but something has to change. I know alot of people running stock head's and not having this problem until higher up in the boost range. 
Originally Posted by HUNTER02SS
The detanation was in the higher rpm's and I did get out of it. I was thinking that it maybe was bad gas from myrtle beach. I am not sure about the tune or timing,but something has to change. I know alot of people running stock head's and not having this problem until higher up in the boost range.
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Detonation in the upper RPM band is bad and more so if you hear it. Most of the time if you hear detonation, the damage is already done or at least started. If you are pushing the tune with the limits of pump gas, you are rolling that dice that you do not get a bad batch of gas.
With a new motor, you do need to retorque the head studs after a couple of heat cycles as the directions state. That can be a factor in the heads lifting.
Keith
With a new motor, you do need to retorque the head studs after a couple of heat cycles as the directions state. That can be a factor in the heads lifting.
Keith
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Seems odd with 12lbs... I run the ls6 heads with bolts and push them about 13-15psi and have not had any problems with the gaskets... I've ran over 100passes on these gaskets and no sign of leakage... Kp also has a near identical setup as mine but with afr heads...
What you torque your head bolts down to?
Jay
What you torque your head bolts down to?
Jay
Hunter, didn't you post that you were running an agressive combo a while back, like a lot of timing? If so, there's your answer. LSx's don't like or need a lot of timing compared to SBC's.
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From: Kennesaw, Georgia
Originally Posted by Pro Stock John
Hunter, didn't you post that you were running an agressive combo a while back, like a lot of timing? If so, there's your answer. LSx's don't like or need a lot of timing compared to SBC's.
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From: Kennesaw, Georgia
Originally Posted by Blownramair
Seems odd with 12lbs... I run the ls6 heads with bolts and push them about 13-15psi and have not had any problems with the gaskets... I've ran over 100passes on these gaskets and no sign of leakage... Kp also has a near identical setup as mine but with afr heads...
What you torque your head bolts down to?
Jay
What you torque your head bolts down to?
Jay
I didn't build the engine,but i did not retorque the head's after it was built.That probably did not help any.
