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International Automotive Technicians Network
Re: 90 GMC G-2 Van Code 43
Posted to Technical Discussion Forum on 9/12/2000

Scott

I've seen this before on a reman engine, Check the casting numbers to ensure you got 350 block AND 350 heads. I've seen 305 blocks with 350 heads and the bigger combustion chamber won't allow the engine to "Knock" under the test. I know you got a 4bolt... Login to read more.