First LS1 Engine rebuild

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Jul 7, 2022 | 10:48 PM

tjervis

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3rd Gear

Joined: Jul 2022

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From: Louisville

First LS1 Engine rebuild

This is my first LS1 engine rebuild. My question is in the front of the engine block directly above the crankshaft and the front main cap there are two threaded bolt holes. Does anything go there? This engine was out of the car when I got it. My service manual does not show anything. Want to make sure before I put he cover on. Thanks for any help!

Jul 7, 2022 | 11:10 PM

C5MSG2004Vert

Drifting

Joined: Mar 2018

Posts: 1,365

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From: New Jersey

Need to show a picture of what you are talking about.

Jul 8, 2022 | 06:06 AM

frodo84

Uneducated autodidact

Joined: Feb 2001

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From: West of the Sabine, Texas

Might be holes for a timing chain dampener. Need to see a pic.

Jul 8, 2022 | 07:44 AM

leadfoot4

Team Owner

Joined: May 2001

Posts: 87,367

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From: Western NY

Quote:

Originally Posted by frodo84

Might be holes for a timing chain dampener. Need to see a pic.

That's what I'm thinking, too. Not all the cars got the chain damper, so the holes were unused on some engines.

Jul 8, 2022 | 11:35 AM

tjervis

Thread Starter

3rd Gear

Joined: Jul 2022

Posts: 3

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From: Louisville

Hope this pic went through

Jul 8, 2022 | 11:44 AM

leadfoot4

Team Owner

Joined: May 2001

Posts: 87,367

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From: Western NY

Quote:

Originally Posted by tjervis

Hope this pic went through

It did, and yes, it appears that those are the unused damper holes.

Jul 8, 2022 | 12:31 PM

tjervis

Thread Starter

3rd Gear

Joined: Jul 2022

Posts: 3

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From: Louisville

Quote:

Originally Posted by leadfoot4

It did, and yes, it appears that those are the unused damper holes.

Thanks for your help and peace of mind.

Jul 8, 2022 | 02:32 PM

grinder11

Race Director

Joined: Oct 2004

Posts: 12,864

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Quote:

Originally Posted by tjervis

Thanks for your help and peace of mind.

You're lucky you have them. Many blocks did not have the holes, and some that did weren't threaded/tapped. As for why, I dont know the protocol......

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Jul 8, 2022 | 07:40 PM

vette4fl

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They come on two sizes depending on the bolt center to center measurements.

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