Turbo 5.3 head gasket HELP!
 

I am in the middle of building a Turbo 5.3 and need help on which head gasket to run. The 5.3 is carbed (with MSD 6LS) and has a stock bottom end, cam, new valve springs. It has 862 heads and stock bore. I need a head gasket that can handle boost. I am installing ARP head studs when i change head gaskets. I plan to run between 8 and 15 pounds of boost from a single 76mm turbo. I also am staying on pump gas. (I am new to this forum so i apologize if this question has been answered, i did not see it) What head gasket would work best for me?

I see a lot of people use LS9 head gaskets, despite the bore mismatch.

Andrew

LS9 gasket 12622033

Gas Filled O-Ring Seals
 

Hi, I like the smaller bore of the 5.3 when fit with a LS-9/Felpro 1041 HG.

The LS-9 = 4.100" bore with a .051" compressed thickness.
The Felpro 1041 = 4.135" bore with a .041" compressed thickness.

Now you have the choice to fit a Gas Filled S/S O-Ring of .062" with receiver grove inside the HG bore.

This method is in common use among Turbo Race Engines.

Lance

Lance,

Can you clarify this please?

Andrew

Sleves "Proud"
 

Hi Andrew, thanks for the request !

There have been MANY engines wherein I have made the sleeves "proud".

The SAME method is to fit an O-Ring.

THUS a double "wall" or a "fire band" !

Lance

Get on Summit and type in LS1 head gasket. $35 a pair and will suit your build nicely. LS9's are overkilll for that.

Holley ECU? What did the logs show, air fuel, duty cycle etc

A buddy maxed out his fuel system last month and went 14:1 for a handful of passes, kinda suprised it's still alive.

If his engine has low variance in the AFR distribution between cylinders, then 14.1 is not lean enough to hurt anything.

We run engines richer because we are attempting to keep the lean cylinders alive.

Andrew