Dedicated to the Promotion and Preservation of American Muscle Cars, Dealer built Supercars and COPO cars. |
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#5
09-19-2000, 07:28 PM
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Re: aluminum bb engine
John, you are looking for a casting number on the heads. This is a RAISED number located under the valve covers. It is not stamped. You need to have the heads off the car to get the casting date as it is located on the underside of the runners. The casting number for the ZL-1 open chamber heads ends in "074" it is a 7 digit number.
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