Dartswinger70 said

Yes, when following what I call the 340 recipe ( which IMO can be applied to the 318 if the parts are available) you have the 340 360 heads with the open chambers meaning you would use the piston to bump up compression with either zero or positive deck height.

The other way is what I call the 273 recipe which is zero deck height pistons and closed chamber heads, I am not 100 sure the 273 is zero deck height but in pictures it appears so and the 273 HiPo has 4 valve releifs like the low comp 340 of late 71-73, but that Hipo version had closed chamber heads.. I prefer the big port large valve 340/360 heads, but this is just to get into 5500-6000 rpm range. I have personally put a 600 Holley and a cam into an otherwise stock 318 added headers and it was fun but it wasn't a power maker at 5500 RPPM and I suspect it was the stock LA heads and valve float etc. Just my $.02 :)

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