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can i swap a 94 4.3 vortec in place of a 98


mansopoor
11-08-2007, 12:52 PM
I have a 98 Blazer 4X4 with a 4.3 vortec, and its leaking coolant into the oil. I also have a 94 Astro all wheel drive with a 4.3 vortec, the motor from the Astro is a new GM the crete motor with 50,000km on it and the Blazer has 250,000km can i put the 94 into my 98 Blazer, as the two motors are different and what do I have to do to put it into my Blazer. Thanks

blazes9395
11-08-2007, 07:14 PM
Short answer...no. Although they are both 4.3's, the '96 and up were changed dramaticly and will simply not work. You need to find a '96 up engine.

mansopoor
11-08-2007, 10:15 PM
thanks for replying. Would I be able to use the motor if i got the wire harness and computer the Astro van, and will it bolt up to the trans.

herkyhawki
11-09-2007, 01:00 PM
I have a 98 Blazer 4X4 with a 4.3 vortec, and its leaking coolant into the oil. I also have a 94 Astro all wheel drive with a 4.3 vortec, the motor from the Astro is a new GM the crete motor with 50,000km on it and the Blazer has 250,000km can i put the 94 into my 98 Blazer, as the two motors are different and what do I have to do to put it into my Blazer. Thanks

A little longer answer: If you use the heads and intake from the 98, the 94 block will work. if....
* You have to use a new timing cover for a 98 to fit the crank sensor, which th 94 does not have. If it is a late 94 or newer blockthe timing cover will seal OK. If it's an older block you might have sealing prob on timing cover.
** Also be aware the crankshaft must be from late 94 or newer to allow proper fit of the crank-sensor toothed wheel.
Read the long atricle here: http://www.automotiveforums.com/vbulletin/showthread.php?t=534327

It's possible, but if your going to that much work you should just fix the 98.

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