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Generally speaking for a streetable mild to moderately built 302 motor, are press in valve guides durable for the long haul? I'm interested in getting at least another 80,000 out of the motor, the heads I'm looking at are 351 W which recently had press in valve guides installed. Am I being overly optimistic to get that kind of mileage out of the heads? I've never ran a set of heads that had press in guides.

<font size=-1>[ This Message was edited by: Wildcat on 2/7/02 11:33pm ]</font>
 

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If done right and by a competent machine shop, they are actually better than the stock guides (better material than the cast iron of the head). All your aluminum heads use pressed in guides, 99% are bronze in them.

Sometimes you can get by till the next rebuild by knurling the vavle guides. Cheaper costing machine shop process than replacing the guides. Bascially you are pitting a rifling like a gun in the bore of the guide and then reaming it back to the correct size. Usually okay for a stock rebuild and some performance applications.
 
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