Large valved 273

4spdragtop said
But if you are talking ratio, how does the differences in volume make a difference? It's a ratio so the differences/changes would be a mute point? I understand it would affect compression PSI.
I also understand its math/physics.

A 340 doesnt sit out of the bore as much? Sorry, brainfart here, but stroke is the same 273 vs 340? 6.123?

Yep I understand the compression change with heads(open vs closed chamber)
Thanks guys, trying to absorb.......beer is easier to absorb lol

The difference in chamber volume isn't as huge compared to cylinder volume. So say one bore in a 273 is 585 cc at bottom dead center and at top dead center 65 cc that would be 9:1 now say a 340 at bottom dead center 780 cc and 65 cc at top dead center would be 12:1 now if you switch to a 78 cc chamber it still would be 10:1. A 273 would have to go to a 58.5 cc chamber. it just gets harder and harder to get race cr out of small displacement like 12.5 plus.