From Windsor, Ontario With Love.... [PIC]

In the 50s, Ford's small block was the "Y Block" configured V8 that was used in increasing displacement and performance enhancing upgrades. In 1961, Ford's Windsor plant developed a new 90° small block which was a more modern light weight and efficient replacement. A 221 cid Windsor was used with success in the '62 Fairlanes and Meteors. They really struck success with the 260 cid which was easily tweaked to a 1:1 260 HP with just a 4bbl carb, a 9.2:1 compression ratio and a slightly hotter cam. That engine's designation was the XHP-260. That same year in 1962, Carroll Shelby received a shipment of these engines to power his British AC roadsters and easily brought the engine to a race ready 335 HP which he graced the rocker arm covers with "XHP-260-1" script. 1964 saw the introduction of the 289 and ready as an option was the 271 HP HiPo solid lifter K-Code 289 ready in time for the '65 Mustang K-Code package which Shelby immediately bumped it to 306 HP. That 289 was a expensive build causing it to be dropped as a production option in favor of the 351 and the 390 V8s. Windsor offered its own variant of the 351 but it was considered second to the 351 engineered at Ford's Cleveland, Ohio plant.

Here's the race version XHP-260-1 engine in an early 1962 Cobra. (EXOTO):