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I have a set of afr heads is there a serial # on them?
#150 is found, but that is the pn
Only a barcode will have all the info pertaining to them....most people remove that barcode prior to installation. Without that your on your own unfortunately if you don't have access to the original purchasers paperwork.
Check the valves are sealing, the deck is straight, the cc of the chamber volume, and confirm the heads flow reasonably well and you have it covered.