| Tom,
The oil cooler on my P-Port 20B is approx. 10 x 11 x 3.5 (going from memory), but I'm also running a Laminova oil-to-water exchanger in series. The hottest oil is sent to the Laminova, then to the oil/air exchanger. Return "cool" water is routed through the Laminova on its way back to the engine. If you're looking to cool 400 hp using only oil/air coolers, I would double the core size of my single cooler. Of course, this all depends on the effectiveness of your intake and exit plenums.
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