LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

What is the Factory Compression Rating?

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Old Jun 3, 2008 | 11:42 PM
  #1  
19z28camaro02's Avatar
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What is the Factory Compression Rating?

10.4:1 or 10.1:1 I've heard both. Trying to get it right.
Old Jun 3, 2008 | 11:49 PM
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I always thought around 10.5:1 or so. Maybe it is 10.4:1 then.

EDIT: it is 10.4:1

http://www.grandsport.org/lt1vslt4.htm
Old Jun 3, 2008 | 11:53 PM
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19z28camaro02's Avatar
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I looked there, I just wasn't sure if thats correct because I have heard somewhere else, can't remember exactly where, that it was 10.1:1
Old Jun 3, 2008 | 11:55 PM
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10.4:1 on this site too http://www.lt1engine.com/tech/category/tech-articles/
Old Jun 3, 2008 | 11:56 PM
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93-95 f-body factory manuals show 10.5:1. The 1996 manual shows 10.4.
Old Jun 3, 2008 | 11:58 PM
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19z28camaro02's Avatar
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Thanks!
Old Jun 4, 2008 | 12:04 AM
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Damnit....why 96 have to suck, oh well hopefully the 1074's helped.
Old Jun 4, 2008 | 05:55 PM
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The b-body iron head LT1 is 10.0.
Old Jun 4, 2008 | 06:03 PM
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in my 93 manual it says 10.5 to 1
Old Jun 4, 2008 | 11:36 PM
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The technical paper on the LT1 ("New Generation Small Block V8 Engine") that GM presented at the SAE conference in February 1992 shows the SCR as 10.5:1. I've also seen it listed as both 10.5:1 and 10.4:1 in GM literature. It definitely is not 10.1:1.
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