LS1TECH - Camaro and Firebird Forum Discussion

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

casting numbers?

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Old 03-26-2007, 09:59 AM
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whats the best casting number for lt1 heads..i have a 94 if it matters..thanks
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Old 03-26-2007, 10:07 AM
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You should have the 374 castings then. They are pretty much the most preferred by porting companies.
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Old 03-26-2007, 03:18 PM
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ya 374 or 643 like on my 95 are about the best to port with. A few companies only use those castings when they CNC port.
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