| 1990 | Buick | Electra | 3.8L/231 | OHV V6 | LN3 | Vin "C" | Buick | Plenum gasket not included. Use new head bolts. |
| 1990 | Buick | Reatta | 3.8L/231 | OHV V6 | LN3 | Vin "C" | Buick | Plenum gasket not included. Use new head bolts. |
| 1990 | Buick | Riviera | 3.8L/231 | OHV V6 | LN3 | Vin "C" | Buick | Plenum gasket not included. Use new head bolts. |
| 1990-1991 | Buick | LeSabre | 3.8L/231 | V6 | Plenum gasket not Included. Use new head bolts. |
| 1990-1994 | Buick | Regal | 3.8L/231 | OHV V6 | L27 | Vin "L" | Buick | Plenum gasket not included. Use new head bolts. |
| 1990 | Oldsmobile | 98 | 3.8L/231 | OHV V6 | LN3 | Vin "C" | Buick | Plenum gasket not included. Use new head bolts. |
| 1990 | Oldsmobile | Delta 88 | 3.8L/231 | OHV V6 | LN3 | Vin "C" | Buick | Plenum gasket not included. Use new head bolts. |
| 1990 | Oldsmobile | Toronado | 3.8L/231 | OHV V6 | LN3 | Vin "C" | Buick | Plenum gasket not included. Use new head bolts. |
| 1990-1991 | Pontiac | Bonneville | 3.8L/231 | OHV V6 | LN3 | Vin "C" | Buick | Plenum gasket not included. Use new head bolts. |
| 1991 | Buick | Reatta | 3.8L/231 | OHV V6 | L27 | Vin "L" | Buick | Plenum gasket not included. Use new head bolts. |
| 1991-1993 | Buick | Riviera | 3.8L/231 | OHV V6 | L27 | Vin "L" | Buick | Plenum gasket not included. Use new head bolts. |
| 1991-1994 | Buick | Park Avenue | 3.8L/231 | OHV V6 | L27 | Vin "L" | Buick | Plenum gasket not included. Use new head bolts. |
| 1991-1992 | Oldsmobile | Toronado | 3.8L/231 | OHV V6 | L27 | Vin "L" | Buick | Plenum gasket not included. Use new head bolts. |
| 1991-1994 | Oldsmobile | 98 | 3.8L/231 | OHV V6 | L27 | Vin "L" | Buick | Plenum gasket not included. Use new head bolts. |
| 1992-1994 | Buick | LeSabre | 3.8L/231 | OHV V6 | L27 | Vin "L" | Buick | Plenum gasket not Included. Use new head bolts. |
| 1992-1994 | Oldsmobile | 88 | 3.8L/231 | OHV V6 | L27 | Vin "L" | Buick | Plenum gasket not included. Use new head bolts. |
| 1992-1994 | Oldsmobile | Silhouette | 3.8L/231 | OHV V6 | Vin "L" | Buick | Use new head bolts. Plenum chamber gaskets not included, use RTV. |
| 1992-1994 | Pontiac | Bonneville | 3.8L/231 | OHV V6 | L27 | Vin "L" | Buick | Plenum gasket not included. Use new head bolts. |
| 1992-1994 | Pontiac | Trans Sport | 3.8L/231 | OHV V6 | Vin "L" | Buick | Use new head bolts. Plenum chamber gaskets not included, use RTV. |