By Kiran Menon March 17, 2026 4:05 pm EST
But that was the last anyone heard of this experimental race V8, which reminds us of the Ford 427 "Cammer" and the 426 Hemi – the former was banned from NASCAR. So what's with the "Calliope" name, you ask? A Calliope is a uniquely American instrument –more specifically, a steam organ that's capable of producing high-pitched sounds from its many long and short tubes. Observe the V8, and you'll notice the velocity stacks share a resemblance with the instrument's whistles, plus it's entirely American.
Schoneck, who has now cast the cylinder head, revealed some of the engine's intricacies. Although the 427 Calliope was a clean-sheet design, he noticed the oil filter adapter looked very FE-like. But that's about it. The engine follows a semi-hemi or pent-roof combustion chamber layout with a pushrod three-valves-per-cylinder design, featuring two intake valves measuring 1.66 inches and a single exhaust valve that's 1.809 inches in diameter. The intake manifold is a part of the head casting, as are runners and the individual throttle bodies, according to Schoneck.
A unique design quirk that will grab your attention is how the exhaust camshaft is located about 4.5 inches higher than the intake camshaft. Also, the exhaust ports are oval, which should open doors for some interesting high-performance header styles. All told, it's still very much a work in progress.