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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Chamber size - 10207643

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Old 01-10-2008, 05:37 PM
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Default Chamber size - 10207643
Anyone know the combustion chamber size of this casting head?

10207643
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Old 01-10-2008, 05:50 PM
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Aluminum LT1 heads have 54cc combustion chambers.
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Old 01-10-2008, 05:57 PM
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I thought it was 56cc?

I may be mistaken but I think I've seen both numbers appear in different places.
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Old 01-10-2008, 06:00 PM
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Thanks for the quick response...what does a 67 or 68cc chamber do to our compression? Im going to call my machinist in the AM but curious what others are running with aftermarket heads. Trying to understand what the compression diff would be opposed to stock combustion chamber.
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Old 01-10-2008, 06:01 PM
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54CC is the norm,some have said the got their set CC'd and they came in at 55cc and some were 54cc
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Old 01-10-2008, 06:02 PM
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Originally Posted by Stroked96Bowtie
Thanks for the quick response...what does a 67 or 68cc chamber do to our compression? Im going to call my machinist in the AM but curious what others are running with aftermarket heads. Trying to understand what the compression diff would be opposed to stock combustion chamber.
68cc chamber would drop your compression a lot.

Smaller chamber = larger compression.
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Old 01-10-2008, 08:02 PM
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Originally Posted by infinitebird
68cc chamber would drop your compression a lot.

Smaller chamber = larger compression.
yeah and Im looking for higher comp just curious how dramatic of a drop it would be.
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