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Author Topic: difference between motors  (Read 2106 times)

91318isfoundation

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difference between motors
« on: July 07, 2008, 10:55:27 AM »
whats the main difference between the 91 m42 and a 93 m42? becuaz i cracked the head on my 91 so ima just buy a used motor and i got another ecu with a chip for my 91 m42 will that chip work with the 93 m42?
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E30nate

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difference between motors
« Reply #1 on: July 07, 2008, 12:30:29 PM »
there are only minor differences in the valvetrain. smaller valve stems is the only difference i think. and the intake manifold. use your old manifold and it all works perfect. my 91 has an engine from a 95 in it right now and it runs perfect.
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