Marine 273 build

Now it's coming together,,

TR Benj,

Sounds like a 1968 273, with Flat Top Pistons {w/Notches} and 'Open-Chamber
#675 Cylinder Heads.

As per your 'post', the Pistons are sitting at {-.012"} 'below' the Deck.

If you want to stay with the current 'Pistons', you will undoubtedly need the
#302 Cylinder Heads to get the compression up for more power.

That's the only thing that will work.

The 'more' Compression, the 'better' that 340 Camshaft will work...

Below {#4323302} Cylinder Head