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block numbers heads

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06-04-2012, 02:37 PM

69biscayne 69biscayne is offline

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Re: block numbers heads

found this on a corvette site.

3991492 was a service only casting that was machined as a replacement for all earlier big port/big valve heads, so check the casting numbers again. They could very well have been used for "LT-1 crate engines".

The "2" may just not show up or be very faint.

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