Like you, when we first looked at these heads, we imagined them hanging out of the engine compartment of a Model A or 1933 Ford. The real market might be X275 radial racers that you see at events like No Mercy in South Georgia. It makes sense when you consider these heads are capable of flowing 471 cfm at 0.800 lift on the intake side and 320 cfm on the exhaust side when they are prepped for racing. Since the Radial classes have turbo-size restrictions, racers are forced to push both cubic inches and cylinder head flow to make power. Hemi head valves are placed across the cylinder bore and inclined toward the center resulting in better airflow than a wedge design in a relatively small package. Add boost and a snort of methanol and you have a high horsepower small-block that fits into a Radial-class Fox Mustang. The heads are already approved for X275, Ultra Street, and Pro Drag Radial, and likely more when the dry-jacketed racing versions hit the marketplace.