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1990 Chevy 1/2 tons were available with a 4.3L V6, 5.0 V8, 5.7 V8, 7.4 V8, and a 6.2 diesel. Pretty sure the Z71's could have any of those engines.

the Z71's have a 5.7 350 vortec. the regular 1990 models that just have the 4wheel drive in them and not the Z71 package have a regular 305. the heavy duty trucks then have a 7.4 454. but as far as the Z71, i have a 1998 Z71 and all my buddies have Z71's and i have not yet ran into a Z71 that didnt have a 5.7 vortec 350

the z71 only referred to the performance package also available in 2 wheel drive the k and v series are both 4x4 the k and r are both engine series of the 5.7 my "90 has the 5.7 Liter 350 but its not a vortec .I've seen carberated versions turbo and throttle body fuel injected 4.3, 5.0, 5.7 , 7.4 gas and 6.2 and 6.5 diesel engines all on 1/2 ton z 71s take a look in the junk yard they are very popular there second only to Ford

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Q: What motor does a 1990 Chevy z71 have?
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