on an AMC V8 the date is cast into the distributer housing on the duraspark ign models.
the build date is stamped onto the inside of te timing cover
there is a build date code on the exhaust manifolds too
Ive seen date stamps along with over sizes printed onto crank bearing shells
now I realize its likely for all of these bolt on things to have been changed, but its a start
77 CJ5, in a bunch of sanded and primered pieces
here you go..
the engine number is located on a pad behind the water pump on those 134 ci fours and on a pad on the block deck visible between the first two exhaust manifold runners on the passenger side for the v-6. if its a four cyl. up to 1967 will start with a 4J followed by a six digit sequential serial number.
1st digit=market=M-military, E-export, D-domestic
2nd digit=year=L-1965 v-6, M-1966 v-6, N-1967 v-6, P-1968 v-6, R-1969 134&v-6,S-1970 134&v-6, T-1971 134&v-6
4th thru 6th digits=build date
7th & 8th digits=internal dimensions=A-.010 undersize crank and rod bearings, B-.010 oversize bores, M-.010 undersize mains 134 only, P-.010 undersize rod bearings 134 only, AB-.010 undersize main and rod bearings
9th digit=type=S-service engine, R-short block
10th thru 11th digits=134 compression ratio=60-6.0:1, 63-6.3:1, 67-6.7:1, 71-7.1:1
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