Ford has had a Triton (truck) V-10 out for a while in 5.4L and 6.8L sizes.
I assume they rounded 6.8L up to 7.0L and converted that to 427 cu inches. Close enough all things considered. In normal form, this truck engine isn't a big HP producer, more about torque than anything else. I'd have to assume that in order to get more than 1 HP/cube they'd have to have a supercharger involved.
Quote:
6.8-LITRE TRITON V10 ENGINE
The 6.8-litre Triton V10 engine features a split-pin crank design for even firing. The resulting imbalance, typical of any even-firing V8 engine, is cancelled out with the balance shaft. The result is noise reduction and improved vibration and harshness (NVLI) characteristics and durability. High flow water pumps enhance the V10's cooling. A new aluminium radiator with a remote fill design system and upgraded fans and fan clutches promote cooling efficiency.
The engines feature a fail-safe cooling strategy, built into the EBC-V engine processor. This alerts the driver to overheating or loss of coolant and begins an alternating sequence of cross-bank, half-cylinder firing to protect the engine against damage.
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7L is probably the absolute displacement limit on this Triton engine, so unless the 'mine is bigger than yours' competition moves on to cylinder counts, I think the truck engine of choice for Cobras will remain the 460 with the Viper V10 (proven capable of 500+ displacement) a close, if not equal, second.
Finally, size-wise. The Triton V-10 is a huge engine, and not just in width, but in height as well. Fully dressed, the Ford V-10 probably stands a solid 4 feet tall, if not more. Look at the new Cobra R's; in order to fit the 5.4L DOHC engine in them they had to not only railse the hood, but put a 'cowl induction' (nudge nudge) bulge in it to clear the engine. I don't think this family of engines is going to go easily into that good Cobra. Plus it's kind of a messy looking engine with all the wires, hoses and sensors, wide as it is tall as it is long. A beachball of an engine with Borg garnishments.