[ 232 - 258 ] [ Late 258 ] [ 304 V8 ] [ 327 V8 ] [ Buick 350 V8 ] [ 360 V8 ] [ 401 V8 ]
AMC 401 CID V8
The six digit Engine Code is stamped on a metal tag on the front of
the right Valve Cover.
1st Digit/Year
7- 1974
8- 1975
9- 1976
1- 1977
2- 1978
2nd & 3rd Digit
Month
4th Digit/Compression ratio
Z- V8-401 4V-8.35:1 Compression Ratio
T- V8-401 4V-8.35:1 Compression Ratio (Heavy Duty)
5th & 6th Digit
Month
Note: Odd engine size characteristics will be stamped to the upper
half of the Engine Code Plate as follows:
B- 0.010" Oversize Cylinder Bore
C- 0.010" Oversize Camshaft Bores
M- 0.010" Undersize Main Bearings
P- 0.010" Undersize Wrist Pins
PM- 0.010" Undersize Wrist Pins and Main Bearings
