What cam to use in a 318

YY1 said
Those are fairly obvious observations.

If you use 1967 pistons (and change nothing else) on an 8.8 engine, what is the new compression ratio?
If you use 1986 pistons (and change nothing else) on an 8.8 engine, what is the new compression ratio?
If you use 5.2 Magnum pistons (and change nothing else) on an 8.8 engine, what is the new compression ratio?

If you use 1967 (920) heads (and change nothing else) on an 8.8 engine, what is the new compression ratio?
If you use "302" heads (and change nothing else) on an 8.8 engine, what is the new compression ratio?
If you use Magnum heads (and change nothing else) on an 8.8 engine, what is the new compression ratio?

...and the several other potential combinations.

I love it!!!! A thinking man.

Dartswinger70 said
What do the heads flow (cfm) that would give you something to go on for cam selection.

Just what I’d like to know before a cam is selected along with a bit more information of course….. but cylinder head flow is really good to know.

Dan the man said
No valve reliefs, would that cause piston to valve clearance problems?

That depends on a slew of things. How far the piston is down the hole, how big the valves are & how much lift the cam has, or actually the actual valve lift. Head gaskets selection also has a play on this.