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Re: Engine code or date code?
10 21 is the engine assembly date- October 21
YS suffix code is for a 1969 396 truck engine, 310hp, 4bbl carb, manual transmission
There should be a letter at the very beginning of the stamped code that will tell you the engine factory.
F- Flint, MI (1955-1966)
V- Flint, Mi (1967 and newer)
T- Tonowanda, NY
K- St. Catherine, Ontario
S-Saginaw, Mi
M- Mexico
The date cast into the block is the date when the block was cast and which shift it was cast on.
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'51 South Bend Model "9A"
'56 Chevy 3600 NAPCO
'74 Chevy Cheyenne Super K20-restored on 37's
'72 GMC Sierra Custom K2500- in progress
'08 GMC Envoy Denali
'12 GMC Sierra 2500HD Denali
'17 GMC Yukon XL
VCCA member #58596
http://www.nohrco.com
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