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What years of motors will interchange with a 1999 blazer 4.3 4x4?

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SOURCE: I have a 1996 blazer 4.3 v-6 that has a bad motor.

Any GM vehicle (truck/van/SUV) from 1996 to 2002 will interchange. There were two versions, the LF5 and LF6.

L35 and LF6 SCPI
Major design changes to the 4.3L V6 for the 1996 model year. Like other small block Chevrolet V8s, the 4.3L engine received redesigned heads which had improved airflow and combustion efficiency. These heads are referred to as Vortec heads. Furthermore the 4.3L was upgraded to receive sequential port fuel injection. The fuel system uses six centrally mounted injectors firing into six nylon hoses with poppet valves leading to each intake port. This system was call SCPI (Sequential Central Port Injection). This 4.3L used a two piece manifold, with the upper half manufactured from a composite plastic and the lower half manufactured from cast aluminum.
The engine block was revised with structural reinforcing ribs up front eliminating the two freeze plugs (on the front and back) along with an alloy oil pan (for the S10, Blazer, and Jimmy).
This engine came in two versions, the LF6 rated at 175 hp (130 kW) - 180 hp (130 kW), and the L35 rated at 180 - 200 hp (150 kW). Only the S-series pick-ups used the LF6, while the fullsize trucks, vans and Blazer and Jimmy used the L35 version. The L35 was optional on the S-Series trucks.
Year Horsepower Torque Fuel System Compression Ratio RPO Applications 1996 170 hp (130 kW) @ 4400 rpm 235 lb·ft (319 N·m) @ 2800 RPM SCPI 9.2:1 LF6 5 1997-2002 175 hp (130 kW) @ 4400 rpm 240 lb·ft (325 N·m) @ 2800 RPM SCPI 9.2:1 LF6 5 1996-2002 180 hp (130 kW) @ 4400 rpm 240 lb·ft (325 N·m) @ 2800 RPM SCPI 9.2:1 LF6 6 1996-2002 180 hp (130 kW) @ 4400 rpm 245 lb·ft (332 N·m) @ 2800 RPM SCPI 9.2:1 L35 5 1996-2002 190 hp (140 kW) @ 4400 rpm 250 lb·ft (339 N·m) @ 2800 RPM SCPI 9.2:1 L35 3,4,6 1996-2002 200 hp (150 kW) @ 4400 rpm 250 lb·ft (339 N·m) @ 2800 RPM SCPI 9.2:1 L35 2 1996-1998 200 hp (150 kW) @ 4400 rpm 255 lb·ft (346 N·m) @ 2800 RPM SCPI 9.2:1 L35 1 1999-2002 200 hp (150 kW) @ 4600 rpm 260 lb·ft (353 N·m) @ 2800 RPM SCPI 9.2:1 L35 7

Posted on Dec 19, 2010


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