Hello Rick,

Poor thermal efficiency? Every combustion engine has relatively poor thermal efficiency.
Yes the CVH has an inefficient hemi combustion chamber, but the reason for low specific power output is dreadful cylinder head air flow.

What evidence are you referring to regarding limited heat cycles are suited for ARP studs?
Every road racing engine I have ever built ( including Cosworth 3 liter 405 HP NA engines)
have used ARP head studs. These engines were used for several racing seasons. Mainly
10 lap sprint races. My personal experience differs from yours.