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either 964 or 993 have robust bottom ends but so does a 3.2, the difference is more in the heads and engine management
3.2 has 49/41.5mm valves 40/38mm valves, and V1 motronic 231hp@5900
964 has 49/42.5mm valves 41.5/38mm ports and upgraded Motronic w/ knock sensors 250hp@6100 228lb-ft @4800
993nvr has 49/42.5 valves 43/39mm ports and an even better Motronic w/ hot wire mass flow vs earlier barn door 272hp@6100 242lb-ft@5000
993vr has 50/43.5mm valves 43/39mm ports w/ the variable intake flexibility, 285hp@6100 209lb-ft@5250(max Row hi comp version)
Unseen are hidden things like ceramic port liners that greatly reduce head temps, the 993 heads use RR530 alloy which is much more heat stable this was only used on 930s previously, 993 has an efficient exhaust stock, 993 has zero maintenance hyd lifters etc.
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