Just replaced a 4.3l for a customers s-15. I took the intake off to replace the gasket and the donor engine looked just like yours...f*cking nasty. He was on a budget so I threw it together and tossed it in. It runs awsome and uses no oil. He's going to flush the motor a few times and run bardhal 1 in it... but needless to say I wouldn't worry about yours I think these engines just natually create a certain amount of build up. Don't spend any useless money on it...buy the block and head gasket kit, check for flatness clean well and re-emble...most wreckers give you 90 days warranty anyway.
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