| 76-85 |
2 Piece rear main seal. Valve covers bolt around perimeter. |
200 & 230 |
5.0L
305 CID |
V-8 |
909, 979, 776, 777, 371, 778 |
GM305LA |
GM305RA |
GM305LAT* |
Not Available |
| 85-87 |
1 piece rear main seal. Valve covers bolt around perimeter. Double check rear main seal. This is not a very common engine. |
200 & 230 |
5.0L
305 CID |
V-8 |
535, 551, 627, 058 |
GM305LB |
GM305RB |
GM305LBT |
GM305RBT |
| 87-95 |
1 piece rear main seal, flat tappet. Valve covers bolt down center. Has metal timing cover. |
200 & 230 |
5.0L
305 CID |
V-8 |
535, 551, 627, 058 |
GM305LC |
GM305RC |
GM305LCT |
Not Available |
| 87-95 |
1 piece rear main seal. Valve cover bolt down center. Roller cam engine. Has metal timing cover. |
200 & 230 |
5.0L
305 CID |
V-8 |
535, 551, 627, 058 |
GM305LD |
-- |
GM305LDT |
-- |
| 95-99 |
8 or 10 bolt timing cover. Timing cover is plastic. 12 bolt intake. R and R only. Can use the GM305LD and use tin timing cover. |
200 & 230 |
5.0L
305 CID |
V-8 |
|
Not Available |
-- |
-- |
-- |
| 96-99 |
8 bolt intake. 10 bolt timing cover. |
200 & 230 |
5.0L
305 CID |
V-8 |
880, 878 |
GM305LF |
-- |
GM305LFT |
-- |
| 67-85 |
2 piece rear main seal. Valve covers bolt around perimeter. 2 bolt main. |
260 |
5.7L
350 CID |
V-8 |
245, 379, 010, 014, 678, 388, 618 |
GM350LA |
GM350RA |
GM350LAT* |
GM350RAT* |
| 67-85 |
2 piece rear main seal. Valve covers bolt around perimter. 4 bolt main. |
260 |
5.7L
350 CID |
V-8 |
245, 379, 010, 014, 678, 388, 618 |
GM350LAF |
GM350RAF |
GM350LAFT* |
GM350RAFT* |
| 67-85 |
2 piece rear main seal. Valve covers bolt around perimter. 4 bolt main. This is a cam upgrade. |
275 |
5.7L
350 CID |
V-8 |
245, 379, 010, 014, 678, 388, 618 |
GM350LAFHO |
-- |
GM350LAFHOT* |
-- |
| 86-87 |
1 piece rear main seal. Valve covers bolt around perimeter. 2 bolt main. |
260 |
5.7L
350 CID |
V-8 |
245, 379, 010, 014, 678, 388, 618 |
GM350LB |
GM350RB |
GM350LBT |
GM350RBT |
| 86-87 |
1 piece rear main seal. Valve covers bolt around perimeter. 4 bolt main. Double check the rear main seal. This is not a very common engine. |
260 |
5.7L
350 CID |
V-8 |
245, 379, 010, 014, 678, 388, 618 |
GM350LBF |
GM350RBF |
GM350LBFT |
GM350RBFT |
| 86-87 |
1 piece rear main seal. Valve covers bolt around perimeter. 4 bolt main. This is a cam upgrade. |
275 |
5.7L
350 CID |
V-8 |
245, 379, 010, 014, 678, 388, 618 |
GM350LBFHO |
-- |
GM350LBFHOT |
-- |
| 88-95 |
1 piece rear main seal. Valve covers bolt down center. 2 bolt main. Has metal timing cover. Flat tappet. Works for carbureted or fuel injected. 12 bolt intake. |
260 |
5.7L
350 CID |
V-8 |
548, 526, 148, 638 |
GM350LC |
GM350RC |
GM350LCT |
GM350RCT |
| 88-94 |
1 piece rear main seal. Valve covers bolt down center. 4 bolt main. Has a metal timing cover. |
260 |
5.7L
350 CID |
V-8 |
548, 526, 148, 638 |
GM350LCF |
GM350RCF |
GM350LCFT |
GM350RCFT |
| 88-94 |
1 piece rear main seal. Valve covers bolt down center. 4 bolt main. This is a cam upgrade. Has a metal timing cover. |
275 |
5.7L
350 CID |
V-8 |
548, 526, 148, 638 |
GM350LCFHO |
-- |
GM350LCFHOT |
-- |
| 88-94 |
1 piece rear main seal. Valve covers bolt down center. Roller cam engine. Has metal timing cover. Also available in dyno-tested version: GM350LDCD. |
260 |
5.7L
350 CID |
V-8 |
548, 526, 148, 638 |
GM350LD |
-- |
GM350LDT |
-- |
| 95-99 |
1 piece rear main seal. Roller cam. Timing cover plastic. 12 bolt intake. Mechanical fuel pump. Can use GM350LD and use tin timing cover. |
260 |
5.7L
350 CID |
V-8 |
880 |
GM350LE |
-- |
GM350LET |
-- |
| 95-99 |
1 piece rear main seal. Roller cam. Timing cover plastic. 12 bolt intake with electric fuel pump. |
260 |
5.7L
350 CID |
V-8 |
880 |
GM350LEI |
-- |
GM350LEIT |
-- |
| 96-05 |
1 piece rear main seal. Roller cam. Plastic timing cover. Has 8 bolt intake. Mechanical fuel pump. |
260 |
5.7L
350 CID |
V-8 |
880 |
GM350LF |
-- |
GM350LFT |
-- |
| 96-05 |
1 piece rear main seal. Roller cam. Plastic timing cover. Has 8 bolt intake. Electric fuel pump. |
260 |
5.7L
350 CID |
V-8 |
880 |
GM350LFI |
GM350RFI |
GM350LFIT |
-- |
| 73-90 |
2 piece rear main seal. Oval intake port heads. |
330 |
7.4L
454 CID |
V-8 |
289 |
GM454LA |
GM454RA |
GM454LAT |
GM454RAT |
| 73-90 |
2 piece rear main seal. Round intake port heads. This engine is a direct substitute for the GM454LA or GM454RA. |
330 |
7.4L
454 CID |
V-8 |
959, 445, 286, 775 |
GM454LAS |
GM454RAS |
GM454LAST |
GM454RAST |
| 73-90 |
2 piece rear main seal. Oval intake port heads. This engine is a cam upgrade. |
350 |
7.4L
454 CID |
V-8 |
289 |
GM454LAHO |
-- |
GM454LAHOT |
-- |
| 91-97 |
1 piece rear main seal. Oval intake port heads. Flat tappet. |
330 |
7.4L
454 CID |
V-8 |
182, 313 |
GM454LB |
GM454RB |
GM454LBT |
GM454RBT |
| 91-97 |
1 piece rear main seal. 10 bolt timing cover. HO series. R and R only. |
360 |
7.4L
454 CID |
V-8 |
182 |
GM454LC |
-- |
GM454LCT |
-- |
| 96-99 |
Gen VI. 6 bolt timing cover. Roller cam engine. Electric fuel pump. |
330 |
7.4L
454 CID |
V-8 |
297, 313 |
GM454LD |
-- |
GM454LDT |
-- |
| -- |
Gen IV. 2 piece rear main. Flat tappet. Head casting 188. H.O. series. |
370 |
7.4L
454 CID |
V-8 |
286 |
GM454LE |
-- |
GM454LET |
-- |
| 91-97 |
Gen V. 1 piece rear main seal. Steel crankshaft. Flat tappet. Electric fuel pump. Head casting 088. |
330 |
7.4L
454 CID |
V-8 |
182 |
GM454LF |
-- |
GM454LFT |
-- |
| 91-97 |
Gen V. 1 piece rear main seal. 4 bolt main. Roller lifters. Head casting 088. Need customer's heads. |
330 |
7.4L
454 CID |
V-8 |
297 |
GM454LG |
-- |
-- |
-- |
| 96-03 |
1 piece rear main seal. Roller. 6 bolt timing cover. Head casting 156. |
330 |
7.4L
454 CID |
V-8 |
297 |
GM454LH |
-- |
-- |
-- |
| 70-76 |
Oldsmobile engine. |
325 |
7.5L
455 CID |
V-8 |
297 |
GM455LA |
-- |
-- |
-- |
| 91-98 |
Standard base replacement. R and R only. |
360 |
8.2L
502 CID |
V-8 |
859 |
GM502LA |
-- |
-- |
-- |
