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Old 11-02-2010, 09:24 AM   #1 (permalink)
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94 4.3 Vortec Info needed

I'm looking to do an engine swap and I found a 94 4.3 "vortec" engine with 100,000 for $100. I've heard these are the shitty flowing heads and in '96 they redsigned the heads and flow much better. So my question, should I hold off and wait till i come acorss a '96 or newer engine or is the 94 still decent?
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Old 11-02-2010, 09:32 AM   #2 (permalink)
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the 96 and newer are 205 hp and obd2 the 93 to 95 are 180 or 195 hp so i would hold out for the 96 and newer
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Old 11-02-2010, 09:41 AM   #3 (permalink)
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Can you just swap out heads? or is the intake and internals different?
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Old 11-02-2010, 09:48 AM   #4 (permalink)
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are you going efi or carb?
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Old 11-02-2010, 09:54 AM   #5 (permalink)
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looking for efi - swapping into a 84 cj7
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Old 11-02-2010, 10:36 AM   #6 (permalink)
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you can't use the 96 or newer efi on the older short block the cps tone ring will not fit on the old crank
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Old 11-02-2010, 10:53 AM   #7 (permalink)
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alright thanks! i appreciate the info. I'll keep looking
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Old 11-10-2010, 04:47 PM   #8 (permalink)
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As long as you have the 1994 Vortec version, it will run strong. I've had them all. The 1996 isn't that much better than the 1994.
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Old 11-11-2010, 09:15 AM   #9 (permalink)
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Sorry to hijack but I have a similar question. I've got a 94 tbi that needs replaced. Can I swap in a 96 or newer4.3? Will the tbi intake bolt to the newer heads?
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Old 11-11-2010, 09:23 AM   #10 (permalink)
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No, it will not. I tried it years ago. Vortec and non-vortec heads are completely different. The non-Vortec heads have the intake bolts angle, while the Vortec heads have them straight up and down. The Typhoon / Cyclone guys use to go through extensive machine work to get the Vortec heads on their non-Vortec motors, since its like a 50 HP upgrade on those turbo trucks.
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Old 11-12-2010, 07:40 AM   #11 (permalink)
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But if the 94 is a vortec, will the tbi intake bolt to 96 and up heads? My valve covers say vortec and the intake bolts go straight into the head not angled
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Old 11-12-2010, 07:14 PM   #12 (permalink)
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94's are not actually vortecs even tho they say it all over them. tbi's 93 and previous and cpi's 93-95 are non vortec motors.

true vortecs have the plastic upper Pentium aswell.
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Old 11-13-2010, 04:53 AM   #13 (permalink)
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Quote:
Originally Posted by shatnr View Post
94's are not actually vortecs even tho they say it all over them. tbi's 93 and previous and cpi's 93-95 are non vortec motors.

true vortecs have the plastic upper Pentium aswell.
They've been using the Vortec name since something like 85, although it wasn't widely publicized until the CPI engine with Vortec on top of the engine. I got into an argument with a guy one time about it and got my ass handed to me. He had an old magazine ad from when they first put the 4.3 into the S10s that referred to it as a "Vortec" engine.

I don't know when you can "officially" start calling the 4.3 a Vortec. I suppose 96 would probably be it.
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Old 11-13-2010, 10:34 AM   #14 (permalink)
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Ill throw in some pics to add to the confusion.

These are true vortec heads. Look at the relationship between the intake Pentium bolts and the intake plane.


This is a non-vortec head. The bolts are at 90 degrees to the intake plane.


My motor, even says vortec on the top....is not a real vortec imo. Because it does not have the true vortec heads on it.

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Old 11-14-2010, 01:05 PM   #15 (permalink)
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What Heads do the 94 cpi's have then? Same as the tbi heads?
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