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  1. bad valve and what else?

    I swapped a 4.0 from a 92 explorer into my 90 bronco 2. when i started it for the first time it was extreemly hard to start and smoked ALOT of white. i decided to take the heads off and see whats going on, i found a burnt exhausr valve in one cylider and tan colored cylinder walls in another...

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