head casting and date code .
Team Owner
Joined: Apr 2008
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From: Middle TN by way of KY, OH, VA, IL, CA, FL, NY, SC, HI
Heads have a date code but it's under the valve cover and not judged.
However, if you want correctness, the head casting date needs to be before the engine build date (not engine casting date) if it has one - which has to be before the car build date.
NCRS guidance says no more than 6 months before the car build date, but closer is more common.
Head casting date codes will be XyyZ, where X = month, in letters A-L, yy will be date of the month 1-31, and Z will be the last number of the year, 0-9.
You will also need the right casting head part number for your 58.
However, if you want correctness, the head casting date needs to be before the engine build date (not engine casting date) if it has one - which has to be before the car build date.
NCRS guidance says no more than 6 months before the car build date, but closer is more common.
Head casting date codes will be XyyZ, where X = month, in letters A-L, yy will be date of the month 1-31, and Z will be the last number of the year, 0-9.
You will also need the right casting head part number for your 58.
