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#1
08-10-2021, 01:32 PM
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Those tires were made in or after 1971 which is when the United States Department of Transportation mandated all tire manufactures use a standardized 10 digit DOT Tire Identification Number.
Goodyear Wide Tread GT RWL tires which came on 1968 and 1969 Z/28s will not have that DOT + 10 digit number sequence 
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#2
08-10-2021, 07:28 PM
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According to the table in the Anghel Restorations paper, the DY means 6th week of 1972
Scratch that -- that table is for an 8 digit code. Since this one is 10 digits that would not apply! Duh ...
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Jeff Helms 65 Z16 Survivor 65 Z16 drag car 66 Chevelle L78 unrestored 67 Chevelle L78 unrestored 67 Camaro SS350 Survivor Last edited by jeffschevelle; 08-10-2021 at 08:35 PM.
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#3
08-11-2021, 06:48 AM
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That is a pre 70 Goodyear dating system. EVERY license plate on post 70 tires has all numbers on a single cavity insert. - variable data - the ones Charlie has shown have a 3 digit variability, which I believe follows the older Good Year system. How are the dates on anyone's original 69 Z tires configured?
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~JAG~ NCRS#65120 68 GTO HO 4 spd Alpine Blue /Parchment 2 owner car #21783 71 Corvette LT1 45k miles Orig paint - Brandshatch Green - National Top Flight - last known 71 LT1 built. 71 Corvette LT1 42k miles Original paint - Black - black leather - only black LT1 known to exist. NUMEROUS Lemans blue Camaros, Monza Red and Daytona Yellow Corvettes & a Chevelle or two... Survivors, restored cars, & other photos https://picasaweb.google.com/lh/myphotos
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#4
08-11-2021, 01:43 PM
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Quote:
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#5
08-11-2021, 02:31 PM
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Quote:
What they probably are are tires manufactured by Goodyear in the 1971 - 1972 time frame. They are not original equipment tires for a 69 Z/28. They are replacement tires that you bought at a Goodyear Tire Store when yours wore out.
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#6
08-11-2021, 07:29 AM
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#7
08-11-2021, 02:35 PM
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First I'm not familiar with this type of raised letter/# and 3 digit stamping. If we were to conclude this is a 10 digit code DYLCJ6A372 then this was manufactured the 37 week of 1972. This configuration used on this tire doesn't represent the mid to late 60's dating system. The odd thing is the spare tire is correctly dated March of 69
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Steve Shauger The Supercar Registry www.yenko.net Vintage Certification™ , Providing Recognition to Unrestored Muscle Cars. Website: www.vintagecertification.com
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