I never buy lottery tickets, but will this week. If by chance I would win millions, some lucky engine shop will be building several 413s and 440s.

And on top of that, we will need to find a 1962 300 to get some baseline performance figures, then pull out the 413. build a 440 with the exact same CR (rotating assembly only) finishing up the 440 with the parts from the 413.

My point- $$$ is the only way to do a true apples to apples comparison. Build the 413 and the 440 side by side using the EXACT same components/specs (with the exception of the 440s larger bore)

There really is no sense in debating it, the only way to put this to rest is spending $$$.

Why dont the mods feed this thread a tall glass of kool-aid....

btw- the only advantage the 413's smaller bore has over the 440 is less parasitic friction.