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09-23-2023, 03:29 PM
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#1 |
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Registered User
Join Date: Oct 2012
Location: Plymouth In.
Posts: 100
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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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09-23-2023, 04:37 PM
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#2 |
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Registered User
Join Date: Jun 2015
Location: Carlos MN
Posts: 2,136
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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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09-23-2023, 05:10 PM
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#3 |
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Moderator
 
Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,204
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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. 
__________________
Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox 
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09-26-2023, 06:06 PM
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#4 |
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Senior Member
 
Join Date: Mar 2015
Location: washington
Posts: 2,299
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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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