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The differences in "Real Estate" between the 25 and 3.2 heads and block vary greatly. The absolute largest we can take a 2.5 bore wise is 89mm (from 85.5mm stock), the 93mm bore of the 3.2 is way too large.. The way the valves are positioned puts them right at the edge of the bore, increasing complexity.
Basically the 3.2 is a small bore 3.4, thats one reason why the 3.2 doesn't see cylinder failures nearly as catastrophic as the 3.4, or any of the earlier 2.5 and 2.7 engines.
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Threaded Mode
