I have a 2004 LQ4 engine that has 18k miles on it. I'm following an article that uses mostly factory pieces to get to 464hp. It's my first LS-based endeavor, so I'm not getting too exotic.

OK, the question: What is the factory head gasket thickness?

I can find all kinds of data, but not something as simple as this.

Thanks...

 

.051" in most cases.