Turbo 5.3 head gasket HELP! - LS1TECH - Camaro and Firebird Forum Discussion

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Turbo 5.3 head gasket HELP!

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Old 06-20-2017, 02:04 PM
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Default 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?
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Old 06-20-2017, 07:29 PM
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I see a lot of people use LS9 head gaskets, despite the bore mismatch.

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Old 06-21-2017, 07:30 AM
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LS9 gasket 12622033
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Old 06-21-2017, 12:00 PM
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Default 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
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Old 06-21-2017, 12:13 PM
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Originally Posted by Pantera EFI View Post
....

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

.....

Lance
Lance,

Can you clarify this please?

Andrew
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Old 06-21-2017, 08:21 PM
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Default 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
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Old 06-21-2017, 09:08 PM
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Get on Summit and type in LS1 head gasket. $35 a pair and will suit your build nicely. LS9's are overkilll for that.
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