Not exactly comparable, but a reference point? We ran 3 1971-1973 455 stock blocks converted to 5 billet Program Engineering main caps. Ran stock, race prepared "N" crankshafts ground with maximum fillet radius to 2.200" Aluminum BME connecting rods. Ran as much as 350 HP plate big shot nitrous at times. Then converted to Plate and port combination at around 400-450 HP eventually running upper and lower foggers in the 500 HP range on the stock blocks. HP was in the 1200 HP range. Never broke a "N" crankshaft. Did eventually break all three blocks in the same place, up the #2 oil feed hole all the way to the camshaft tunnel. One block broke at both the #2 and #4 oil feed holes up to the cam. We ran our blocks open, no concrete. With 1/8 mile long burnouts and long run times, we needed the cooling. Not sure if this is helpful or not. My 2 tidbits of advice would be: 1. Get your rotating weight as light as possible, aluminum rods a must for heavy nitrous loads. 2. Retard your timing more than you think is possibly correct. Best of luck with your heavy hitter.
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