How do I know if I have a 350 or 305 in the 91 Chevrolet 1500 pickup truck

Asked by Feb 25, 2016 at 10:46 AM about the 1991 Chevrolet C/K 1500 Silverado RWD

Question type: Maintenance & Repair

2 Answers


350 = 5.7L, 305 = 5.0L, or if you have some block numbers I can run them.


should be a white emission label on plastic radiator cover under hood that says 5.0l or 5.7l. If it is destroyed or motor replaced, I look at harmonic balancer on front of crank shaft. If it is about an 1" wide it is a 350, 2" wide it is a 305. Also there are numbers stamped on a pad in front of the driver side head, that can be googled. Could be on passenger, side if older motor.

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