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it depends on how it was driven and anything done to the motor. like nos. or anything.

but i would say in about 50,000 more is a good time to do a engine rebiuld.

because i also have a 89 jimmy 4.3 tbi diefferent but similar.
and it had 225k on it and got an engine rebiuld. and i paid about $3300 to fix it up. and since then it's runs like new again to me.
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