Dyno a 7.5:1 400? Sure, why not?

pishta said

Weight would be significant. Better option would be quench 'turtles' in the combustion chambers, they wouldnt move and being a wedge head, the could be away from the valves. Would have to be fastened somehow and butt against the cylinder wall as they sure would want to move over with every power stroke. You could manufacture them with a .040 ring that would overlap the cylinder in the fire ring of the head gasket so it would be a captive fit..too many fitment issues but....?

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A couple of years ago I welded up a quench head for a Slant, but never got to finish the project. I did consider what you are talking about, but wasn't crazy about the thin shell of combustion chamber they would be attached to...and the water behind it.
I'd like to get the opinion of someone who is versed in balancing reciprocating assemblies. Would the weight of say, a .150 thick slice of aluminum the diameter of the piston head adversely affect the balance of the engine?...at what RPM would it become critical?