1st Digit - 4 = Buick Motor Division
2nd and 3rd Digits - 34 = 67 GS340, 68-70 GS350, 71 GS
46 = 66 GS, 67-69 GS400, 70 GS455
4th and 5th Digits - 07 = 2-door sedan
17 = 2 door coupe
27 = 2 door sedan
37 = 2 door coupe
67 = 2 door convertible
6th Digit - Corresponds with model year (ex. 5=1965, 7=1967)
7th Digit - B = Baltimore, MD
C = South Gate, MI
D = Atlanta, GA
G = Framingham, MA
H = Flint, MI
I = Oshawa, Ontario
K = Kansas City, MO
V = Bloomfield, IL
Y = Wilmington, DE
Z = Fremont CA
Last 6 Digits - Production number sequence
ENGINE CODES - Found on the passenger side of the lifter valley support rail
63 - JT = 401 ci, 4 bbl, 325 horse
JW = 425 ci, 4 bbl, 340 horse
JX = 425 ci, 2x4 bbl, 360 horse
64 - KT = 401 ci, 4 bbl, 325 horse
KW = 425 ci, 4 bbl, 340 horse
KX = 425 ci, 2x4 bbl, 360 horse
65' - LT = 401 ci, 4 bbl, 325 horse
LW = 425 ci, 4 bbl, 340 horse
LX = 425 ci, 2x4 bbl, 360 horse
66' - 34, MT = 401 ci, 4 bbl (Carter AFB), 325 horse
- MR = 401 ci, 4 bbl (Rochester), 332 horse - 11:1 with 425 cam but with same piston/chambers as other 401's
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