Kit for one Rochester TBI injector. GM TBI units run either 1 injector (Model 300 on 4-cylinders) or 2 injectors (Model 220 on V6/V8s) per throttle body.
Per-injector rebuild kit for Rochester TBI (Throttle Body Injection) fuel injectors. Covers the Model 220 dual-injector unit used on GM V6 and V8 trucks and vans (1987-1995), the Model 300 single-injector unit on the Iron Duke 2.5L 4-cylinder (1982-1993), and the Mercruiser 4.3L/5.0L/5.7L TBI marine engines (1994-2001).
How many do I need? The Rochester Model 220 (V6/V8) has 2 injectors per throttle body. The Model 300 (2.5L Iron Duke) has 1 injector. Marine TBI units (Mercruiser 4.3L/5.0L/5.7L) use 2 injectors per unit. Order 2 kits for most V6/V8 and marine applications, 1 kit for the Iron Duke.
GM used Rochester TBI across a massive range of trucks, vans, and passenger cars from the early 1980s through the mid-1990s. The same Rochester injector body was also used in Mercruiser's first-generation TBI marine engines. Same seal dimensions across all three model families.
| Engine | Years | OEM Injector # | Notes |
|---|---|---|---|
| Mercruiser 4.3L TBI | 1994–2001 | 3855182 / 852956A1 | V6, 2 injectors per TBI unit. Marine pressure: 38 psi. |
| Mercruiser 5.0L TBI | 1994–2001 | 17104288 / 852956A1 | V8, 2 injectors per TBI unit. |
| Mercruiser 5.7L TBI | 1994–2001 | 17104288 / 852956A1 | V8, 2 injectors per TBI unit. |
The Model 220 is a dual-injector throttle body — 2 injectors per unit, one per bore. Used on 4.3L, 5.0L, and 5.7L engines in Chevrolet and GMC trucks, vans, and SUVs.
| Vehicle | Engine | Years |
|---|---|---|
| Chevrolet C/K Pickup (C1500/C2500/K1500/K2500) | 4.3L V6 / 5.0L V8 / 5.7L V8 | 1987–1995 |
| GMC Sierra C/K Pickup | 4.3L V6 / 5.0L V8 / 5.7L V8 | 1987–1995 |
| Chevrolet Suburban C/K | 5.7L V8 | 1987–1995 |
| GMC Jimmy / Chevrolet Blazer | 4.3L V6 | 1987–1994 |
| Chevrolet S10 / GMC S15 Pickup | 4.3L V6 | 1988–1994 |
| Chevrolet Astro / GMC Safari Van | 4.3L V6 | 1988–1995 |
| Chevrolet G-Van / Express (G10/G20/G30) | 5.0L V8 / 5.7L V8 | 1987–1995 |
| Chevrolet Camaro | 5.0L V8 / 5.7L V8 TBI | 1987–1992 |
| Chevrolet Caprice / Impala SS | 5.7L V8 | 1991–1995 |
The Model 300 is a single-injector throttle body — 1 injector per unit. Used on GM's 2.5L Tech IV "Iron Duke" 4-cylinder. Same Rochester TBI injector body; same seal kit.
| Vehicle | Engine | Years |
|---|---|---|
| Chevrolet S10 / GMC S15 Pickup | 2.5L Iron Duke 4-cyl (Tech IV) | 1982–1993 |
| Chevrolet Cavalier / Pontiac Sunbird | 2.5L Iron Duke 4-cyl | 1985–1990 |
| Pontiac Firebird | 2.5L Iron Duke 4-cyl | 1982–1984 |
| Buick Skylark / Oldsmobile Cutlass Ciera | 2.5L Iron Duke 4-cyl | 1985–1989 |
| Pontiac Grand Am / Pontiac 6000 | 2.5L Iron Duke 4-cyl | 1985–1991 |
Marine Mercruiser TBI (common to all three displacements):
Rochester Model 220 automotive (V8 5.7L high-flow, common part):
Note: The Rochester TBI-220 and marine Mercruiser TBI injectors use the same physical housing and o-ring dimensions, but they are calibrated at different fuel pressures (automotive: ~12 psi, marine: ~38 psi) and have different flow rates. The seal kit fits both — just note that marine injectors are NOT interchangeable with automotive units even if they share o-ring dimensions.