This is talked about a lot in MotoGP as some of the bikes are “Screamers” and some are “Big Bang” aka Under bore and over bore. And it changes year to year as motors are being developed.
As Rat said, your limited to the parts you can get off the shelf. My brother builds custom Cosworth racing engines, seeing the costs for custom parts to rebuild these things is more than your willing to spend for a turn key car you’ve not purchased yet.
Clearly your way over thinking these kind of things. It not like your racing and the B/S is going to add anything to engine combo for improved lap times. Also we’re talking about 50-60 year old engines. There are what they are… Engine development is expensive. Just look at the cost of a Steve Morris engine…
