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6.5L Turbo Diesel 1992-00 6.5L Turbo Diesel - Welcome to the Internet's first discussion forum for the 6.5L diesel engine. Tips on performance, upgrades, cooling, fuel economy, troubleshooting and more.

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Old 04-15-2018, 06:03 PM
jggiedeman jggiedeman is offline
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Default Date code stamped in block near PMD

I have a 506 block, 1255506, E148. Figured it to be made May 14th, 1998. The code I'm referring to is actually not stamped but appears to be etched in in the block. Up front on left head bank next to the Inj Pump PMD. Reads YDD 05 27 J8. I figure the 05 27 refers to May 27th.

So what is the YDD and J8?

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1994 K3500 CC LB Silverado. Next project. Built for endurance, power and gearing. Plan on opened up intake and exhaust sytem, best cooling mods, 4.11 gearing 4L80E, followed by Gear Vendors OD. Need to be able to split all gears and have lockup in 2nd/3rd/4th. Tan interior cloth, Bad ass dark blue (coming) aluminum wheels and air ride (coming)
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Old 04-15-2018, 07:47 PM
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DmaxMaverick DmaxMaverick is offline
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Assembly line info (date, shift, crew, etc.). The date may be correct (2 weeks after casting isn't unreasonable), but you'll need an original Dick Tracy decoder ring to make sense out of the rest. I've heard several explanations, but none of them the same, and they are not consistent from plant to plant. Your guess is probably as good as theirs, unless someone chimes in who actually worked at that plant, at that time.
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