Vortec Heads
#1
02-12-2006, 05:53 PM
Vortec Heads
I have a '91 Blazerwith a 4.3. I'm not sure if I have vortec heads or not. How can you tell? If I dont have vortec's can I put a set on without modification?
#2
02-13-2006, 01:54 AM
RE: Vortec Heads
Well, usually you either have the 4.3 Vortec or the 4.3 TBI
The TBI has a large round air filter on top of an injector unit that looks like a carb
The Vortec has a large intake manifold on top and usually says "Vortec" in orange down the middle. Fuel delivery with the Vortec is more conventional, with 6 fuel injectors instead of one.
I know it's not the most technical response, but now you can pop the hood and go "Oh, it's...", lol
The TBI has a large round air filter on top of an injector unit that looks like a carb
The Vortec has a large intake manifold on top and usually says "Vortec" in orange down the middle. Fuel delivery with the Vortec is more conventional, with 6 fuel injectors instead of one.
I know it's not the most technical response, but now you can pop the hood and go "Oh, it's...", lol
#4
02-13-2006, 12:05 PM
RE: Vortec Heads
Would I be able to put the vortec heads on my non-vortec motor?
#5
02-13-2006, 01:00 PM
RE: Vortec Heads
ORIGINAL: LoLoS10Blazer87
Fuel delivery with the Vortec is more conventional, with 6 fuel injectors instead of one.
Fuel delivery with the Vortec is more conventional, with 6 fuel injectors instead of one.
Found on another website:
VIN W, RPO L35:
Central Port Injection (CPI/CMPI). Manufactured from 1992-1995. It has central injection assembly mounted in the intake manifold which uses a single batch-fired injector feeding 6 poppet nozzels located at the intake ports. It has a dual-plenum manifold (upper and lower) with variable tuning with a manifold tuning valve to equalize pressure. The manifold looks much like that of an LT1, the throttle body is at the front of the manifold and goes to an intake tube with a filter box behind the left headlight. Vortec is written in orange on top of the plenum, which is black or aluminum colored.
190 to 195hp, 260ft/lbs
VIN W, RPO L35:
Central Sequential Fuel Injection (CSFI), Sequential Fuel Injection (SFI). Manufactured from 1996 to 2003. CSFI uses six individual injectors and a fuel pressure regulator that pulses fuel through six orifices through flexible nylon tubes. These tubes run to poppet valves at the intake ports. Manifold setup is similar to TBI, except it has one bore and one throttle blade. Air filter box is located behind driver?s side headlight.
180hp, 245ft/lbs (2wd pickups), 190hp, 250ft/lbs (Blazers and 4x4s).
Central Port Injection (CPI/CMPI). Manufactured from 1992-1995. It has central injection assembly mounted in the intake manifold which uses a single batch-fired injector feeding 6 poppet nozzels located at the intake ports. It has a dual-plenum manifold (upper and lower) with variable tuning with a manifold tuning valve to equalize pressure. The manifold looks much like that of an LT1, the throttle body is at the front of the manifold and goes to an intake tube with a filter box behind the left headlight. Vortec is written in orange on top of the plenum, which is black or aluminum colored.
190 to 195hp, 260ft/lbs
VIN W, RPO L35:
Central Sequential Fuel Injection (CSFI), Sequential Fuel Injection (SFI). Manufactured from 1996 to 2003. CSFI uses six individual injectors and a fuel pressure regulator that pulses fuel through six orifices through flexible nylon tubes. These tubes run to poppet valves at the intake ports. Manifold setup is similar to TBI, except it has one bore and one throttle blade. Air filter box is located behind driver?s side headlight.
180hp, 245ft/lbs (2wd pickups), 190hp, 250ft/lbs (Blazers and 4x4s).
More to the point of the last post here. The only way to tell if they would work would be to match up the head gaskets, measure deck heights, bolt them up to a test motor, etc. All of which needs to be done way before thinking of running a motor with them. Things to look for are the correct alignment of coolant passages, piston to valve clearances, alignment of the intake manifold runners and coolant passages, etc. There are too many items to list, but if you had a good set of tools and some time, you could go to a junk yard and do most of the comparison yourself on engines in the yard.
#6
02-13-2006, 02:25 PM
RE: Vortec Heads
Again Kyle, I bow before you [sm=hail.gif]
I knew that, but it's amazing what you forget after a few beers, lol.
I knew that, but it's amazing what you forget after a few beers, lol.
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