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Discussion Starter · #1 ·
Ok so I got a 1998 Chevy Silverado. My friend just bought a CarMD so i decided to plug it into my truck for fun. It came up with the Codes P0420 and P0430. Which means: Catalyst System Efficiency Below Threshold (Bank 1) and Catalyst System Efficiency Below Threshold (Bank 2). What does that mean and how do I fix that?

Also Im trying to figure out what generation engine I have in my truck. Its the 5.7L 350 but I cant find anywhere which generation that is. Im trying to figure this out because I want to buy a engine from a salvage yard, rebuild it and put it into my truck. This is the book im looking at:

Also, do I have to find a 350 engine from the exact year truck I have or can it be from any Third Generation Chevy or GMC truck?

Also, do you know if there are any performance rebuild kits for that engine?


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