No Replacement for Displacement (myth or fact)

SSVDP said
What has NOT been discussed is that the most important factor is intake valve size and that is determined by the cylinder bore size.

Yes Bore size to Valve size is the ultimate limit of how much HP your N/A engine can make but take a stock 4.04 bore and build 2 engines one with stock crank 3.31"=340 and one with a 4"=410 and take both to the mean piston speed limit of say 4800ft/min 340=8700 and 410=7200 which the 340 rev's 21% higher and is 21% smaller than the 410 which would equal them out.

So if a larger displacement allows larger intake valves it will have more torque and power throughout the rpm range. With a 273 the valve size is limited by the small bore.

Yes my 273 3.625" bore will limit my total N/A HP? Stock 273/318 heads flow 175cfm and ported stock valve 273/318 heads can flow 225+cfm even though those were flowed on 4" bore, Have yet to find flow numbers on a 273 bore but have found 350 1.94-1.5 heads flowed on both a 350 4" bore and 305 3.75" bore which is still bigger than my 273 bore but dodge has better valve placement the 350 head loss 5-10cfm accross the board on the 305 bore. I think ported out RHS heads would let me build 500+hp at 8000rpm if i wanted to take it that far but ported stockers making 400hp at 6600-7000rpm is all I'm looking for.