LS7 Block casting

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Sep 19, 2016 | 02:40 AM

aussiemartin69

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Cruising

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LS7 Block casting

Can anyone tell me exactly where the 7.0 is cast on an LS7 block, or a picture would be good. Thanks Aussiemartin.

Sep 19, 2016 | 08:57 AM

Steve Haefner

Racer

Joined: Dec 2015

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From: New Melle, Missouri

2018 C6 of Year Finalist

Quote:

Originally Posted by aussiemartin69

Can anyone tell me exactly where the 7.0 is cast on an LS7 block, or a picture would be good. Thanks Aussiemartin.

Back of the block

Sep 19, 2016 | 08:59 PM

aussiemartin69

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Thanks Steve. We are trying to find an easy way to identify LS7 blocks without dismantling anything. Our Off Road Racing Pro class only allows up to 6 litres. Ideally we would like to be able to identify them quickly and easily in scrutineering. I have a list of the block casting numbers for 6.0, 6.2 and 7.0 litre motors, but I am not sure if it is complete, or if this a reliable way of checking. Obviously if the number was ground off, that would get us interested, but we then need other identifying features to confirm. Thanks again, Martin.

Sep 20, 2016 | 12:00 AM

Unreal

Team Owner

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From: Gilbert AZ

Considering all LS blocks could be 4.8-7.4L with just swap of internals/sleeves/pistons I'm not sure if looking at a block is going to tell you much.

Sep 20, 2016 | 11:13 AM

Petraszewsky

Racer

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My block says 5.3 on it but it's resleeved and stroked to a 7.0

Sep 20, 2016 | 07:05 PM

Steve Haefner

Racer

Joined: Dec 2015

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From: New Melle, Missouri

2018 C6 of Year Finalist

The only way would be to use a CID tester like this one. The procedure would be to remove all the spark plugs and put this in one cylinder. Then remove the rockers for that cylinder and boom u got it.

You might not do this for everyone, maybe just say all class winners will be tested for CID or something. This is obliviously and intrusive test.

http://www.speedwaymotors.com/Speedw...ester,703.html

Sep 21, 2016 | 08:11 AM

aussiemartin69

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Thanks guys. I realise the internals can easily changed to increase the capacity but if we could easily identify LS7's externally, it would simplify things.
Thank you all for your input, Martin.

Sep 23, 2016 | 09:47 PM

LEAVINU

Le Mans Master

Joined: Oct 2006

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From: Cumming, GA

Quote:

Originally Posted by Steve Haefner

Back of the block

This marking is also stamped on the front passenger side of the block as well. You can see it with the car on a rack using a light. It's tucked behind the water pump outlets.