1955:
287cid 518037
1956:
316cid 521560
1957:
347cid 523293
1958:
370cid 528456
1959:
389cid 532000
1960:
389cid 536387
1961:
389cid 538181
421SD 538181
1962:
389cid 538181
389cid 542426 SR
421SD 538181
1963:
326cid 538211
389cid 543680
421cid 544988
1964:
326cid 9773153
389cid 9773155
421cid 9773157
1965:
326cid 9778840
389cid 9778789
421cid 9778791
1966:
326cid 9778840
421cid 9778791 early
421cid 9782611 late
1967:
326cid 9786339
400cid 9786133
428cid 9786135
1968:
350cid 9790079
400cid 9790071
400RA 9792506
428cid 9792968
1969:
350cid 9790079
400cid 9790071
400RA ID 9792506
428cid 9792968
303cid 546313
400RA V 9792968
428RA V 545887
Note: 67-68 428's were all 4 bolt main, in 69 the YH code 428 was 2 bolt, the rest were 4 bolt.
1970:
350cid 9799916
400cid 9799914
400RA III 9799914
400RA IV 9799915
400RA V 481708
455cid 9791140
1971:
350cid 481980
400cid 481988
455HO 483677
455cid 485428 late HO
1972:
350cid 481990
400cid 481988
455cid 485428
1973:
350cid 488986
400cid 481988
455cid 485428
455SD (490)132
1974:
350cid 488986
400cid 481988
455cid 485428
455SD (490)132
1975:
350cid 488986 early
350cid 500810 late
400cid 481988 early
400cid 500557 late
455cid 500813
1976:
350cid 500810
400cid 500557
455cid 500813
1977:
400cid 568557
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Block identification
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