The new-generation engine that debuted with the 1968 models at a displacement of 472 cu in (7.7 L) was designed for an ultimate capacity potential of 600 cu in (9.8 L). Displacement was increased to 500 cu in (8.2 L) for the 1970 model Eldorado, then adopted across all models for 1975. Performance waned after peaking at 420 hp (313 kW) and over 550 foot-pounds force (750 N·m) of torque in the first year and further declined in 1971 and later years due to reductions in compression ratios necessitated by the advent of low-octane unleaded fuel and increasingly stringent emission requirements.
It's from this page.
The author of this section of the article writes that the 472/500 casting of Cadillac's engines were designed for an ultimate capacity potential of 600 cu in. If this is true, and I,m not writing that it is, Cadillac may have intended to increase the stoke every year or two just so show up Lincoln. But then the whole Fuel with no Lead , oil embargo, EPA thing, put an end to the plan.
Any truth to any of this?
Could a crank with a stoke that long even fit in the block?