The build # is located next to the type # on the engine case. The build # represents the number of production engines assembled in the engine department. From the initial data you can see that the first production engine 900101 was build # 1. The build #'s stay in lock-step with the serial #'s until engine type 901/20 is introduced, this occurring near build 3500. The build #'s show that approximately 12000 aluminum 901 cases were produced.
As far as I know, nearly all type 901/xx engines, except prototype and 914/6 engines, get the build #.
I will edit this list as I get more data. Please submit this info to me if you have a type 901/xx engine. I'll be very interested to see how high the build #'s go. The current highest build # is 26342, and perhaps it could go higher.
According to the production pages from the first 911's, the build number was called the internal number by the factory.
_Type_ Serial # Build # Pair # Dates
901/01 900101 1
901/01 900102 2
901/01 900108 8 27
901/01 900129 29 52
901/01 900130 30 107
901/01 900136 36 47
901/01 900220 120 206
901/01 900223 123 496
901/01 900274 174 232
901/01 900279 179 274
901/01 900294 194 275 no dates yet 1.01 2.01
901/01 900426 326 436
901/01 900373 273 369
901/01 900490 390 553
901/01 900543 443 495 11/64
901/01 900593 493 717 11/64
901/01 900601 501 720 11/64
901/01 900627 527 --- 12/64
901/01 900628 528 552
901/01 900685 585 767
901/01 900718 618 --- 11/64 12/64
901/01 900723 623 775
901/01 900740 640 666 11/64
901/01 900775 675 843
901/01 900812 712 963
901/01 900848 748 1024 12/64
901/01 900930 830 130
901/01 900981 881 64/12/12
901/01 901025 925 --- 64/12 65/1
901/01 901193 1093 --- 64/12
901/01 901211 1111 --- 64/11
901/01 901238 1138 --- 64/11
901/01 901299 1199 549 64/12
901/01 901310 1210 509 64/12 65/1
901/01 901514 1414 11
901/01 901572 1472 --- 64/11
901/01 901587 1487 816 65/03
901/01 901635 1535 286
901/01 901761 1661 372
901/01 901826 1726 150
901/01 901926 1826 50
901/01 901978 1878 125 65/3 65/1
901/01 902065 1965 255
901/01 902086 1986 305
901/01 902214 2114 516
901/01 902248 2148 777 65/06
901/01 902286 2186 682
901/01 902465 2365 --- 65/04 &06
901/01 902471 2371 --- 65/05
901/01 902556 2456 --- 65/06
901/01 902586 2486 950 65/06
901/01 902713 2613 --- 65/05
901/01 903068 2968 607
901/01 903073 2973 671 65/08
901/01 903084 2984 571 65/07
901/01 903135 3035 736
901/01 903139 3039 787
901/01 903179 3079 774 65/08
901/01 903216 3116 271
901/01 903308 3208 276 65/05
901/01 903356 3256 790 65/03 &06
901/01 903504 3404 76 65/08
901/01 903519 3419 69 65/08 &09
901/01 903569 3469 58 65/09
901/01 903581 3481 200 in sync
901/20 906101 ???? first of this type
901/01 903614 3515 out of sync
901/01 903622 3523
901/01 903650 3552
901/01 903656 3558
901/01 903667 3570
901/01 903671 3574
901/01 903708 3613 435 65/09 &10
901/01 903716 3621
901/20 906106 3629
901/01 903731 3637
901/01 903760 3669
901/01 903770 3680
901/01 903804 3716
901/01 903812 3724
901/01 903816 3728 635 65/08 &09
901/01 903830 3743
901/01 903850 3766
901/01 903868 3787 623 65/08
901/01 903900 3821
901/01 903910 ???? last of this type
901/05 907001 ???? first of this type
901/05 907041 3879
901/05 907059 3900
901/05 907068 3909
901/05 907112 3954
901/05 907113 3955
901/05 907114 3958
901/20 906137 3979
901/05 907137 3984
901/05 907148 3995
901/05 907151 3998
901/05 907153 4000
901/05 907183 4036
901/05 907192 4045
901/05 907201 4054
901/05 907203 4056
901/05 907215 4068
901/05 907237 4090
901/05 907239 4092
901/05 907248 4101
901/05 907251 4104
901/05 907284 4137
901/05 907294 4150
901/05 907300 4156
901/05 907303 4159
901/05 907316 4172 381
901/05 907400 4260
901/05 907406 4266
901/05 907412 4272 65/08
901/05 907413 4273 250 65/06
901/05 907467 4332
901/05 907482 4347
901/05 907507 4372 119
901/05 907508 4373 65/06
901/05 907528 4393
901/05 907540 4405
901/05 907561 4426
901/05 907565 4430
901/05 907576 4441
901/05 907602 4467 186 65/11
901/05 907609 4474 102
901/05 907619 4484 170
901/05 907622 4487
901/05 907631 4496 149
901/05 907637 4502
901/05 907655 4520 987 10/65 and 11/65
901/05 907660 4525 992
901/05 907671 4536 147
901/05 907712 4577
901/05 907720 4585
901/05 907731 4596
901/05 907734 4599
901/05 907739 4604
901/05 907766 4631
901/05 907810 4675 894 65/11
901/05 907811 4676
901/05 907812 4677
901/05 907814 4679
901/05 907846 4711
901/05 907847 4712
901/05 907849 4714
901/05 907873 4738
901/05 907907 4772 210
901/05 907919 4784
901/05 907956 4824
901/05 907966 4834
901/05 908021 4889
901/05 908053 4921
901/05 908070 4938 505
901/05 908106 4974 521 66/02
901/05 908120 4988 846
901/05 908140 5008
901/05 908164 5032
901/05 908185 5053 calculated
901/05 909001 5054 calculated
901/05 909010 5063
901/05 909018 5071 864
901/05 909051 5105
901/05 909103 5156
901/05 909130 5183
901/05 909133 5186
901/05 909136 5189
901/05 909167 5221
901/02 960003 5224
901/02 960016 5265 55 66/04/05
901/02 960029 5316
901/02 960035 5322
901/05 909247 5338
901/02 960043 5361
901/05 909294 5409
901/05 909298 5414
901/02 960070 5425
901/02 960073 5428
901/02 960076 5431
901/02 960079 5434
901/02 960090 5449
901/05 909307 5453 282
901/02 960106 5483
901/02 960108 5485
901/02 960116 5518
901/05 909363 5560
901/05 909374 5576 233
901/02 960154 5587 314 66 06
901/05 909416 5645
901/05 909427 5658
901/05 909433 5664
901/05 960183 5675
901/02 960186 5678
901/05 909445 5703
901/05 909451 5709
901/05 909452 5710
901/02 960206 5711
901/02 960219 5724
901/05 909475 5728
901/02 960222 5732
901/02 960241 5763
901/02 960272 5809 494
901/02 960281 5826
901/05 909512 5868
901/02 960306 5873
901/05 909526 5897
901/02 960332 5924
901/02 960355 5962
901/05 909555 5964
901/02 960375 5998
901/02 960377 6010
901/02 960389 6022
901/02 960391 6029 638
901/02 960407 6052
901/05 909857 6099
901/05 909656 6182
901/05 909663 6194
901/05 909666 6202
901/02 960492 6225
901/05 909190 6257
901/05 909701 6265
901/05 909759 6371
901/02 960568 6391 138
901/05 909772 6394
901/05 909782 6414
901/05 909790 6429
901/05 909809 6472
901/05 909810 6473
901/05 909816 6484 54 66/06
901/02 960618 6487
901/02 960624 6497
901/02 960661 6553
901/02 960664 6556
901/02 960667 6559 --- 66/08
901/05 909841 6564 723
901/02 960683 6580 --- 66/06
901/05 909863 6620
901/05 909867 6631
901/05 909884 6667
901/05 909896 6679
901/05 909914 6697
901/02 960753 6723
901/02 960758 6728
901/02 960760 6730 --- 66/08
901/05 909921 6734
901/02 960841 6821
901/02 960903 6885
901/02 960913 6895
901/06 911008 6909
901/06 911016 6921
901/02 960927 6925
901/06 911030 6939
901/06 911042 6960
901/02 960949 7005
901/02 960955 7011 835 66/08
901/06 911088 7042
901/06 911092 7046
901/06 911104 7063
901/02 960981 7067
901/02 961019 7135
901/02 961021 7137
901/02 961030 7150 704 66/08
901/06 911141 7153
901/02 961049 7185
901/02 961055 7191
901/02 961091 7236
901/02 961095 7240
901/02 961108 7253
901/06 911166 7260 907 66/09
901/06 ------- 7269
901/06 911183 7305
901/06 911186 7311
901/02 961146 7314
901/06 911201 7328 837
901/06 911203 7330
901/06 911224 7377
901/02 961178 7383
901/06 911230 7384
901/06 911235 7401 161 66/07/10
901/02 961196 7431
901/02 961201 7450
901/02 961208 7464
901/06 911278 7476
901/02 961225 7484
901/02 961230 7489
901/06 911280 7492 66/10
901/06 911293 7515
901/06 911316 7552
901/02 961276 7591
901/06 911337 7604
901/02 961304 7635
901/06 911361 7657 66/09
901/02 961358 7733
901/02 961363 7738
901/02 961390 7782
901/02 961403 7811
901/02 961414 7827
901/02 961416 7829
901/02 961434 7863
901/06 911455 7869
901/02 961436 7872
901/02 961437 7873
901/02 961439 7875
901/06 911495 7976
901/06 911460 7883
901/06 911465 7894
901/06 911467 7903
901/06 911468 7904
901/02 961457 7908
901/02 961461 7912
901/06 911475 7918
901/06 911476 7919
901/02 961467 7927
901/02 961469 7929
901/02 961472 7932
901/02 961473 7933
901/02 961474 7937
901/02 961477 7940
901/02 961479 7947
901/02 961480 7948
901/02 961490 7961
901/02 961494 7965
901/06 911501 7987 857
901/02 961521 8009
901/06 911518 8025
901/06 911554 8107
901/06 911564 8120
901/06 911568 8137 162
901/02 961591 8144
901/02 961611 8183
901/06 911593 8195
901/06 911596 8204
901/02 961632 8211
901/06 911607 8227
901/06 911609 8229
901/02 961683 8312
901/02 961687 8316 311
901/02 961737 8395
901/06 911696 8450
901/02 961782 8462
901/02 961784 8464
901/02 961787 8467
901/02 961796 8476
901/02 961798 8478
901/06 911718 8504
901/02 961810 8509
901/02 961818 8528
901/02 961836 8559
901/02 961850 8578
901/02 961808 8607
901/02 961887 8640 539
901/06 911790 8665
901/06 911793 8672
901/02 961915 8703
901/06 911812 8706
901/06 911824 8732
901/02 961833 8735 729
901/02 961942 8744
901/02 961947 8755
901/06 911831 8759 720
901/02 961958 8773
901/02 961962 8777
901/02 962004 8846
901/06 911876 8869
901/02 962026 8895 205
901/06 911893 8901
901/06 911896 8908
901/02 962047 8928
901/02 962062 8953
901/06 911920 8965
901/02 962082 8987
901/06 911930 8993
901/02 962089 9002
901/02 962096 9013
901/02 962098 9016
901/06 911946 9036
901/06 911951 9044
901/06 911970 9072
901/06 911971 9073
901/02 962151 9086
901/02 962163 9178
901/02 962166 9181 876
901/02 962170 9195
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