streetknight2

iTrader: (10)

Going on a 408...so 4.030" bore with LS3 heads. I need a .040" thick gasket, but not sure of what bore. I see cometic makes a 4.085 bore gasket, will that work?

conan

iTrader: (5)

Don't know what size the combustion chamber of the ls3 heads is, but you need to choose a gasket the will clear the bigger of the 2 sizes. So if the block bore is bigger than the cc in the head go with a gasket that clears 4.030". If the cc's in the head are bigger go with a gasket that clears the heads. Hope that makes sence.

PREDATOR-Z

Conan, you have the right idea but using wrong comparison. You are comparing a circle diameter (bore) to head cc (volume). What you meant was cylinder bore to head chamber bore. And yes go with a gasket at least .030 bigger than biggest bore.

conan

iTrader: (5)

Thanks man.

z0vette

So.. 0.30 bigger will solve the valve shrouding issue on the 6.0 4.030 bore?
The heads are stock ls3 70cc
What is the idea ?
And why people used to say go bigger on the lift?
Am glad that someone like you participating in this