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C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

head casting numbers???

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Old Nov 15, 2007 | 06:55 PM
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Default head casting numbers???
Whats the difference and what will fit on my 95 corvette?

I plan on buying a used set and sending them to lloyd for porting to minimize down time for my car. Its my daily driver.
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Old Nov 15, 2007 | 08:07 PM
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The most desirable LT1 castings are the "643" followed by the "374". Stay away from the "561". They were from the later model Camaros I believe. Lloyd prefers the 10207643.
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Old Nov 15, 2007 | 11:53 PM
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so what heads should my car have on it?

Also why are those ones more desirable?
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Old Nov 16, 2007 | 06:08 AM
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Check to see in gprocket1 on ebay has any new 643 catings left. He had several in October. They have never been used and he will ship them to the shop directly. His price was $320.00 + ship.
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