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The only thing I’d add to that is that you will find different hp and tq curves on standard 2.5 capacity motors than you will on larger bore 3L motors. I’m talking 8v in this case. Even by going with larger valves you will run out of flow on a large bore 3L or bigger motor. So while your hp and tq will go up, you will hit a wall at about 6k rpms and both curves will tail off steadily. This has been verified by a number of us. I am running over 500whp (real hp not show queen rubbish) on a highly modified 3.1L 8v motor in a racecar with virtually everything improved. The only thing we haven’t changed at this stage is a stock (extruded honed) intake. It does have a larger 66mm T-body. We’re pretty happy to have the performance we have currently and don’t want to shift the curve further across to the RHS for longevity even though a larger plenum, shorter runner intake would be an overall improvement over stock.