4.3 1989 motor and the 1994 vortec 6 cyl which is better - S-10 Forum
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post #1 of 5 Old 12-23-2013, 10:44 PM Thread Starter
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4.3 1989 motor and the 1994 vortec 6 cyl which is better

My baja has the 4.3 but have a chance to get a complete vortec motor out of a 1994 blazer what is the difference ie which is better? And would it bolt right in?

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post #2 of 5 Old 12-24-2013, 08:52 AM
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Re: 4.3 1989 motor and the 1994 vortec 6 cyl which is better

The Vortec is more powerful, but the engine management system is totally different. You would need the entire wiring harness for the engine and the ECU.
It will bolt in, but the electronics will kill you.
Oh, and the tranny in the newer rig is electronically controlled. You would need that also since it provides input to the ECU....

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post #3 of 5 Old 01-11-2014, 08:36 PM
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Re: 4.3 1989 motor and the 1994 vortec 6 cyl which is better

or you could just use the heads from the 94 but I would look more towrds 96 or newer, and get you the edlebrock intake manifold and you can use everything else and be good to go. The heads alone are well worth the swap.
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post #4 of 5 Old 01-18-2014, 02:12 PM
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Re: 4.3 1989 motor and the 1994 vortec 6 cyl which is better

The '94 Vortec heads have the same bolt pattern for the intake as the '89, so yes it is a bolt in if you reuse the intake from the '89. This will allow you to retain the stock '89 electronics. You may want to experiment with spark plug heat range but as the improvement with a vortec head is in the way the air/fuel mixing is enhanced the stock ECM should be able to handle it. I have an '89 S10 2wd Blazer, 5 spd, 4.3 vortec from a '94 with a marine carburated intake, billit 60k volt distributor and stock exhaust. Unbelieveable difference in low end torque and I have surprised many mustang and eclipse owners.

Last edited by Blazn; 01-18-2014 at 02:18 PM. Reason: Left out information
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post #5 of 5 Old 01-18-2014, 08:01 PM
peace and big boobs to u
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Re: 4.3 1989 motor and the 1994 vortec 6 cyl which is better

or you could have your heads ported and get a bigger bump stick with edelbrock manifold. i have heard about the "vortec" heads for several years now but what i've never heard is what they flow in cfm's.

"primer express" 91 RCSB, 4.3 z, 3713 Edelbrock intake and headers, flowmaster exhaust, comp cams 266hr cam and roller tip rockers, ported heads, 3:08 rear. boss 338's 18x8 225/45/18 f 255/55/18 r

opinions expressed are my humble $.02 worth
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