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Old 09-23-2023, 03:29 PM   #1
David623
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compression for a LS 1

What kind of compression should a 1999 LS 1 have? I have a couple of cylinders that have 100 and 105lbs, thinking about pulling motor and replacing it.
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Old 09-23-2023, 04:37 PM   #2
LS short box
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Re: compression for a LS 1

If you don't get an answer here I check with the folks over on LS1tech.com.
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Old 09-23-2023, 05:10 PM   #3
AussieinNC
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Re: compression for a LS 1

"Blower cam" ?

Any long duration cams will drop initial compression pressure.

"Normal" numbers would be around 160 to 175 with no more than a 30% variation between highest and lowest numbers.

Figures of 100 to 105 etc should really be subject to a leak down test before making any rebuild decisions.

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Old 09-26-2023, 06:06 PM   #4
Accelo
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Re: compression for a LS 1

On my LT1, I had over 150psi on all cylinders with a BTR Stage II camshaft.
If your compression is low it's a 90% chance refreshing the heads will fix it.
A decent Lt1 will bring about $2500 in my area. Worth repairing if it's the heads.
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