Inliners International Forums General Discussion Engines 250 or 292?

All true above; 250 is cheaper, you can use 307 SBC pistons, etc.
On the 292 you can still get the liquid propane pistons cheap from Sealed Power, they have much less dish and will increase your compression some. I think they cost an extra $90 in an overhaul kit to get them. Flat top your talking specialty and $$$.