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Old 07-07-2012, 12:55 AM's Avatar is offline
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Probably the clutch fan is wearing out and not locking up properly, basically slipps and doesn't fully lock when hot and won't cool as good. I perfer a big block myself in what ever i can put one in but personal preferance, fuel economy will increase with the Vortec and they are a good engine, a lot lighter too and not as much underhood heat with a small block.
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