273 piston options

Charrlie_S said

I would consider using a 360 head, or a big valve 340/360 head. However, for that to work, you will need to use a custom type piston to make up for the compression loss due to the larger combustion chamber. Also will require notching the top of the block/bore, to clear the big valves.
Been there done that, back in the day.

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I have a set of 360 heads and I’ve considered using those. I’m aware of the notching/shrouding issue but I think perhaps the increased flow capability compensates for that. The chambers are much bigger though so domed pistons and perhaps some cutting on the heads to get to a reasonable static compression.
We have E10 gasoline at 95 octane as well as E85 over here in Sweden and some stations sell 98 octane.