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

Different Casting Numbers

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Old Apr 1, 2008 | 01:32 PM
  #1  
Ekof96Z28's Avatar
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Different Casting Numbers

What is the difference between these heads
Casting Number: 374
Casting Number: 643
Old Apr 1, 2008 | 01:47 PM
  #2  
MadMike 97 Z28's Avatar
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i know its a dumb question but where are the casting numbers on a head?
Old Apr 1, 2008 | 01:54 PM
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MadMike 97 Z28's Avatar
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nevermind found out i have 561's on my 97
Old Apr 1, 2008 | 02:34 PM
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http://web.camaross.com/forums/showthread.php?t=427346

Covers the 643's.

Last edited by Injuneer; Apr 1, 2008 at 02:58 PM.
Old Apr 1, 2008 | 03:22 PM
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So what are the 643's worth? I got a set. Just wondering.
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