141:
163:
shape. Rear wheel drive applications have the starter mounted on the right side of the block (when viewed from the flywheel) and on the opposite side of the block compared to front wheel drive installations. The 2.2l S10/Sonoma had the starter located in the same position as front wheel drive cars. A
405:
291:
Nearly identical to the GM small corporate/metric pattern, except that the starter is located between the cylinder banks, and the lower right bolt hole is moved outward by roughly one inch. Being nearly identical, it too has the distinctive odd-sided hexagonal shape. These engines can be fitted in
472:
Four bolt holes and two locator pins are common to the
Chevrolet and B-O-P patterns. Some transmissions, most notably the TH200-4R, take advantage of this by integrating both specifications into a "universal" bolt pattern casting.
640:
481:
Early
Cadillacs manufactured before 1965 used a "round top" bellhousing very similar to early Buicks; around 1965, the bellhousing pattern was revised until the BOP bolt pattern was adopted in 1968.
164:
rear wheel drive bellhousing is displayed at right, and the integrated front wheel drive bellhousing is displayed at the lower right (in this case, as a part of the GM 6T70 Transmission).
131:
with modifications. These modifications include an additional bolt hole at the top of the pattern, and attachment points for cast oil pans to lower bellhousing extensions, to reduce NVH.
626:
468:
Starters are on the left (driver's) side on Olds 307-455 and
Pontiac and the right (passenger) side on Cadillac 425/472/500 and Buick 225/231/3800/300/340/350/400/430/455.
360:
have a unique round-shaped bellhousing that looks almost the same as bells for the earlier 1953-56 Nailhead, but in fact the circular flange is about 1" smaller.
349:
have a unique round-shaped bellhousing that looks almost the same as bells for the later 1957-66 Nailhead, but in fact the circular flange is about 1" larger.
650:
903:
633:
597:
877:
835:
199:
103:
851:
684:
96:
51:
774:
181:
856:
825:
759:
719:
292:
rear wheel drive vehicles with the right bellhousing and are used in hot rods, kit cars, sand rails and late model
45:
754:
696:
674:
67:
RWD inline 4 (early RWD Variants, later versions may use a FWD pattern, and have two possible starter locations)
861:
799:
769:
731:
726:
117:
320:
304:
830:
749:
679:
515:
171:
714:
691:
86:
618:
526:
The completely re-engineered
Generation III Ecotec includes a new uniquely shaped bellhousing pattern.
804:
764:
418:
377:
279:
585:
574:
563:
552:
794:
313:
258:
111:
74:
64:
404:
809:
706:
462:
458:
225:
25:
601:
310:
123:
85:
904 automatic transmission with an integral
Chevrolet bellhousing. Do not confuse with later
508:
491:
128:
57:
448:
444:
428:
424:
392:
386:
380:
357:
346:
335:
217:
190:
140:
741:
434:
168:
21:
331:
Atlas family engines use a unique bellhousing pattern which no other GM motors share.
897:
265:
248:
240:
236:
232:
272:
252:
29:
293:
82:
414:
373:
202:
160:
666:
454:
301:
221:
196:
107:
78:
244:
403:
369:
207:
187:
174:
139:
586:
https://www.nailheadbuick.com/transmission-adaptors-bell-housings
575:
https://www.nailheadbuick.com/transmission-options-for-the-nailhe
564:
https://www.nailheadbuick.com/transmission-adaptors-bell-housings
553:
https://www.nailheadbuick.com/transmission-options-for-the-nailhe
440:
229:
211:
70:
40:
This was so named because it began with
Chevrolet's V8 engines.
622:
114:- includes the Vortec 3000/181 industrial/marine crate motor)
177:
503:
An example of this pattern can be seen to the right.
77:
inline 4 2.5L/151 in³ (1980-1983). These use a
870:
844:
818:
787:
740:
705:
665:
658:
634:
8:
400:Buick, Oldsmobile, Pontiac (BOP) V8 pattern
662:
641:
627:
619:
159:This pattern has a distinctive odd-sided
545:
90:
89:that uses GM small corporate pattern (
7:
353:Buick Nailhead, Generation 2 pattern
342:Buick Nailhead, Generation 1 pattern
26:manufactured many different engines
457:cast iron V8s after 1967 (1968-85
14:
522:GM Ecotec Generation III pattern
516:LLT and late High Feature family
32:patterns to a relative minimum.
598:"LTG FWD | performance-engines"
443:"Dauntless" Buick engines: the
395:based on the GM 215 (1967-2004)
18:list of GM bellhousing patterns
28:, it has kept variance in the
1:
477:Cadillac V8 pattern, pre-1967
172:60-Degree 2.8/3.1/3.4/3.5/3.9
97:Chevrolet Turbo-Thrift engine
904:General Motors transmissions
600:. 2020-06-23. Archived from
499:GM Ecotec 4-cylinder pattern
435:Buick V6s (225 / 231 / 3.8)
920:
530:GM High Feature V6 pattern
427:(1967-1976) and post-1963
150:GM small corporate pattern
651:United States automotive
364:Buick / Rover V8 pattern
409:
144:
649:Lists of products of
511:(Generation I and II)
485:GM 4-cylinder pattern
429:Buick Small Block V8s
407:
143:
871:Bellhousing patterns
36:Chevrolet V8 pattern
425:Buick Big Block V8s
321:LX5 "Short Star" V6
16:The following is a
410:
145:
129:Generation III V8s
891:
890:
783:
782:
358:1957-66 Nailheads
347:1953-56 Nailheads
311:Oldsmobile Aurora
287:Northstar pattern
210:all 3.2 and 3.5L
136:GM metric pattern
118:Detroit Diesel V8
911:
663:
643:
636:
629:
620:
613:
612:
610:
609:
594:
588:
583:
577:
572:
566:
561:
555:
550:
447:(1967-1974) and
381:215 Aluminum V-8
268:1.8/2.0/2.2 L I4
200:HT4100/4.5/4.9 L
148:Also called the
87:AMC 2.5 L engine
919:
918:
914:
913:
912:
910:
909:
908:
894:
893:
892:
887:
866:
840:
814:
779:
736:
701:
654:
647:
617:
616:
607:
605:
596:
595:
591:
584:
580:
573:
569:
562:
558:
551:
547:
542:
532:
524:
501:
487:
479:
402:
366:
355:
344:
336:GM Atlas engine
329:
289:
261:/Tech-4 2.5L I4
138:
52:small-block V8s
38:
12:
11:
5:
917:
915:
907:
906:
896:
895:
889:
888:
886:
885:
880:
874:
872:
868:
867:
865:
864:
859:
854:
848:
846:
842:
841:
839:
838:
833:
828:
822:
820:
816:
815:
813:
812:
807:
802:
797:
791:
789:
785:
784:
781:
780:
778:
777:
772:
767:
762:
757:
752:
746:
744:
742:General Motors
738:
737:
735:
734:
729:
724:
723:
722:
711:
709:
707:Ford Motor Co.
703:
702:
700:
699:
694:
689:
688:
687:
677:
671:
669:
660:
656:
655:
648:
646:
645:
638:
631:
623:
615:
614:
589:
578:
567:
556:
544:
543:
541:
538:
537:
536:
531:
528:
523:
520:
519:
518:
512:
500:
497:
496:
495:
486:
483:
478:
475:
470:
469:
466:
452:
438:
432:
422:
408:BOP V8 Pattern
401:
398:
397:
396:
390:
384:
365:
362:
354:
351:
343:
340:
339:
338:
328:
325:
324:
323:
317:
308:
288:
285:
284:
283:
276:
269:
262:
255:
215:
205:
194:
185:
180:(also used by
157:
156:
137:
134:
133:
132:
126:
121:
115:
100:
94:
68:
61:
54:
48:
37:
34:
22:General Motors
13:
10:
9:
6:
4:
3:
2:
916:
905:
902:
901:
899:
884:
881:
879:
876:
875:
873:
869:
863:
860:
858:
855:
853:
850:
849:
847:
845:Transmissions
843:
837:
834:
832:
829:
827:
824:
823:
821:
817:
811:
808:
806:
803:
801:
798:
796:
793:
792:
790:
786:
776:
773:
771:
768:
766:
763:
761:
758:
756:
753:
751:
748:
747:
745:
743:
739:
733:
730:
728:
725:
721:
718:
717:
716:
713:
712:
710:
708:
704:
698:
695:
693:
690:
686:
683:
682:
681:
678:
676:
673:
672:
670:
668:
664:
661:
657:
652:
644:
639:
637:
632:
630:
625:
624:
621:
604:on 2020-06-23
603:
599:
593:
590:
587:
582:
579:
576:
571:
568:
565:
560:
557:
554:
549:
546:
539:
534:
533:
529:
527:
521:
517:
513:
510:
509:Ecotec family
506:
505:
504:
498:
493:
489:
488:
484:
482:
476:
474:
467:
464:
460:
456:
453:
450:
446:
442:
439:
436:
433:
430:
426:
423:
420:
416:
412:
411:
406:
399:
394:
391:
388:
385:
382:
379:
375:
371:
368:
367:
363:
361:
359:
352:
350:
348:
341:
337:
334:
333:
332:
327:Atlas pattern
326:
322:
318:
315:
312:
309:
306:
303:
299:
298:
297:
295:
286:
281:
277:
274:
270:
267:
263:
260:
256:
254:
250:
246:
242:
238:
234:
231:
227:
223:
219:
216:
213:
209:
206:
204:
201:
198:
195:
192:
189:
186:
183:
179:
176:
173:
170:
167:
166:
165:
162:
155:
151:
147:
146:
142:
135:
130:
127:
125:
122:
120:6.2L and 6.5L
119:
116:
113:
109:
105:
101:
98:
95:
92:
88:
84:
80:
76:
72:
69:
66:
62:
59:
55:
53:
49:
47:
46:big-block V8s
43:
42:
41:
35:
33:
31:
27:
23:
19:
882:
667:Chrysler LLC
606:. Retrieved
602:the original
592:
581:
570:
559:
548:
525:
502:
480:
471:
445:225 V6
387:Buick 198 V6
356:
345:
330:
294:engine swaps
290:
253:Dodge Dakota
158:
153:
149:
104:153 Inline 4
39:
30:bell housing
17:
15:
535:Cadilac 2.8
463:368 and 425
459:472 and 500
451:(1969-1970)
437:(1964-1988)
431:(1964-1982)
389:(1962-1963)
383:(1961-1963)
154:S10 pattern
99:(post-1962)
83:Torqueflite
58:Vortec 4300
775:Oldsmobile
608:2020-06-23
540:References
415:Oldsmobile
413:Post-1965
374:Oldsmobile
280:High Value
124:Duramax V8
102:Chevrolet
50:Chevrolet
44:Chevrolet
819:Platforms
760:Chevrolet
393:Rover V-8
305:Northstar
259:Iron Duke
228:found in
191:3300/3800
161:hexagonal
112:Iron-Duke
91:see below
75:Iron Duke
65:Iron Duke
20:. Though
898:Category
852:Chrysler
826:Chrysler
800:Chrysler
755:Cadillac
697:Plymouth
685:concepts
675:Chrysler
659:Vehicles
455:Cadillac
319:GM 3.5L
302:Cadillac
271:GM 5.3L
249:Wrangler
241:Wagoneer
237:Comanche
233:Cherokee
222:Chrysler
197:Cadillac
152:and the
108:Chevy II
79:Chrysler
73:with GM
788:Engines
770:Pontiac
732:Mercury
727:Lincoln
421:RWD V8s
419:Pontiac
378:Pontiac
81:custom
720:Taurus
653:brands
494:family
492:Quad-4
449:350 V8
282:engine
110:, pre-
60:90° V6
750:Buick
680:Dodge
370:Buick
266:"122"
224:2.5L
208:Isuzu
188:Buick
878:Ford
857:Ford
831:Ford
805:Ford
715:Ford
692:Jeep
441:Jeep
300:All
251:and
247:and
230:Jeep
212:DOHC
71:Jeep
24:has
795:AMC
765:GMC
514:GM
507:GM
490:GM
314:L47
307:V8s
278:GM
273:LS4
264:GM
257:GM
218:AMC
182:AMC
63:GM
56:GM
900::
883:GM
862:GM
836:GM
810:GM
461:,
316:V8
296:.
275:V8
245:CJ
243:,
239:,
235:,
226:I4
214:V6
203:V8
193:V6
178:V6
169:GM
93:).
642:e
635:t
628:v
611:.
465:)
417:/
376:/
372:/
220:/
184:)
175:L
106:(
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
