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In that case... I had 280,000miles on my 94 4.6 before swapping it out
for a 96 block with 02 heads/cams/intake and it had never been opened,
nor was anything wrong. They are chains in our case and last as you can
see a very long time. :) I know many more people with the same or more
mileage that have never opened the engine either. A few people I've
heard of have had failures but that's very rare and the tensioners will
make up for any very slight slack that might come up.
You are looking at taking all the accessories off, the valve covers, the
front cover etc etc, in other words several hundred dollars worth of
labor. If you have the engine apart for another reason, you could
replace them for piece of mind, but if not, it's rather expensive to
replace a working part that has been tested for over 300,000 miles to
still be within spec.
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Timing Belts
Jun 19 2006, 05:17 PM
