Which Cometic gaskets for LS3?

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Aug 11, 2008 | 07:46 PM

71CamaroLS1

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Heel & Toe

Joined: Jan 2004

Posts: 21

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From: Portland OR

Which Cometic gaskets for LS3?

Just bought an LS3 crate motor to replace my blown-up LS1. I'm going to cam it, and want to bump the compression as much as I can with thinner head gaskets. Anybody got a recommendation as to Cometic part numbers? Anyone know what the piston-to-deck measurement is on an LS3?

Thanks for any help ...

Aug 11, 2008 | 11:40 PM

Trevor @ Texas Speed

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Joined: Oct 2003

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From: Georgetown Texas

We stock the Cometic head gaskets for the LS3 engines in a 4.085" bore size, and they are currently on sale for $139.99 + shipping. We typically use a .045" thickness gasket, but other thicknesses are available. The .045" thickness gasket would give you a comfortable safety margin and net an optimal quench of ~.038" assuming that the piston is .007" out.

Feel free to give us a call with any questions or concerns.

Trevor
Texas Speed & Performance
www.texas-speed.com
806.866.0734

Quote:

Originally Posted by 71CamaroLS1

Aug 12, 2008 | 07:50 AM

Gotcha

Pro

Joined: Apr 2000

Posts: 623

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From: Indianapolis Indiana

I used Cometic # SDL408540 4.085 bore/.040 thk

Raised compression to 11:1 (from 10.7:1)

Aug 12, 2008 | 09:21 AM

71CamaroLS1

Thread Starter

Heel & Toe

Joined: Jan 2004

Posts: 21

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From: Portland OR

Thanks for the answers!

Sep 15, 2013 | 10:15 PM

CSexy06VY

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Joined: Jul 2012

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Quote:

Originally Posted by Trevor @ Texas Speed

what is the best gasket set for a ls2 stock bottom end with ls3 unmilled stock heads? what would the comp ratio be?

Thanks

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