4.3L Vortec motors.
#1
05-05-2009, 06:25 AM
4.3L Vortec motors.
I need some one to tell me about these motors. I'm pretty good with the V8 chevy family, but haven't owned hardly any V6 motors. Only 4.3L I've owned is a TBI motor that was in a 91 S-10 pickup 2wd. I know the early Vortec had that "spider" injection, while the 96 and newer ones have the injection system similer to it's V8 brothers (or is it different?)
I just picked up a 1996 Blazer 4 door with a bad motor. It still runs, but barely. Sounds like a rod is going. Guy I bought it from said it would need a overhaul. I was thinking I could just find another 4.3L Vortec, and swap out the long block. What 4.3L V6 have the vortec heads that will work with the injection system off my 96? Can I use a 4.3L out of a FSC (fullsize chevy)? Should I just buy a rebuild kit, and reuse my current motor? Trying to keep the cost down to a minimum, but still want a good relibile DD.
It's going to be the gf's ride so going to provide the "funds". I'm just the wrench. If it was up to me I'd love to swap in a L31 350 Vortec, and be like "yeah honey, the engine is coming along well"
I just picked up a 1996 Blazer 4 door with a bad motor. It still runs, but barely. Sounds like a rod is going. Guy I bought it from said it would need a overhaul. I was thinking I could just find another 4.3L Vortec, and swap out the long block. What 4.3L V6 have the vortec heads that will work with the injection system off my 96? Can I use a 4.3L out of a FSC (fullsize chevy)? Should I just buy a rebuild kit, and reuse my current motor? Trying to keep the cost down to a minimum, but still want a good relibile DD.
It's going to be the gf's ride so going to provide the "funds". I'm just the wrench. If it was up to me I'd love to swap in a L31 350 Vortec, and be like "yeah honey, the engine is coming along well"
#2
05-05-2009, 06:40 AM
Originally Posted by Wikipedia
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.
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.
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.
#3
05-05-2009, 02:30 PM
I have posted this explanation before... Let me see if I can dig it up again without typing it all back out...
*EDIT*
Here ya go --> CPI and CMFI--what is the difference?? reply #2
*EDIT*
Here ya go --> CPI and CMFI--what is the difference?? reply #2
#4
05-06-2009, 10:45 AM
I priced out the master rebuild kit, and all the other stuff like hoses, tune-up parts, and other stuff to fix the motor that's in it. Just came short of $1000. For a extra $400 I could have a whole remain longblock. I'm trying to keep this on the cheap. What used 4.3L could I use for my 96? I know the vortec heads were added in 96.
#5
05-06-2009, 11:06 AM
Any 96 to mid-02 engine will work. The complete engine.
The term "vortec" was applied as a marketing term with the introduction of the CPI motor in 92. All GM 4.3L engines use the vortec head design.
The term "vortec" was applied as a marketing term with the introduction of the CPI motor in 92. All GM 4.3L engines use the vortec head design.
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