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I have been playing with Dyno 2000 for a while as I am specifying an engine now for a GT40. Your original motor was square (4" bore by 4" stroke). I tried a very popular hyd. roller cam from comp cams which has rated durations of 282/290 and lifts of 0.565" and 0.574". This produces HP = 556 at 6000 RPM and 557 at 6500. Torque is 521 at 4500 and 527 at 5000.
Here is the updated dyno file (including the flow fixes mentioned). RENAME from ZIP to DYN.
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