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Originally Posted by jackass#1
if youre looking for one still in truck it will tell you in the vin. w- for non vortec and z for vortec. i hope that helps alittle.
not for sure how they are marked on the motors themselves. if you find out let me know.
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The W and Z has nothing to do with if it is a vortec. The W was a high end more HP w/cpi intake. All S10 & S10 Blazers 92 & later 4X4 had the W motors. Vortec engines came out in 92, vortec heads came out in 95. You will find the block# on the right side that will tell you if it is a W or Z engine.
A 834#is a W engine.You can find this on any site that has chevy block#s. Hope this helped. I am putting a 3.8 series 2 engine in a 92 Blazer, it came out of a 97 Camaro. With afew mods this little engine is at almost 300HP, But still on hiway miles great on gas!