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They "could" have changed the grade of resin and there would be no way to know as it would look the same. They could have modified the mold slightly and again there would be no way to know unless one had the early and later version and examined both carefully. It takes a very little internal radius to increase strength dramatically. In fact it would be really had to see the difference. Now, if they increased wall stock or added a couple of ribs then they would be very obvious.
It is looking like I will have to get an entire engine. If so I will change the timing chain and oil pump chain before I put it in the car. So much easier working on an engine on a stand!
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