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Engine Codes - 401 V-8

Contributed By: Joe Schaefer

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


Parts Manual: W-1170-R2, Kaiser Jeep Corporation, 1967
Parts Manual: F-76072, AMC, Feb 1972
Parts Manual: F-75080, AMC, May 1980
Parts Manual: 89-81-374-084, AMC, May 1987
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