<< Dodge's new Hemi Magnum V-8 revives one of the most cherished chapters in Chrysler history. From the late 1950s to the early 1970s, Hemi-powered Dodges, Plymouths and Chryslers devoured the competition on racetracks. >>
The article there seems a little misleading to me. The hemi-head V-8 came out around 1951, with the advent of Chryler Corp.'s "modern" V-8.
In a cost cutting move, the block changed over to traditional wedge heads in 1959. There was absolutely NO Chrysler hemi until, 1964, when the competition 426 for Plymouth and Dodge (but NOT Chrysler) sported a revived hemi head. A street version became available in 1966, and was phased out again in 1971. ALL 413's and 440's were exclusively wedge heads, as were all the 318's, 343's, 360's and 383's.
ALL of the engine iterations mentioned above, including the new for 2002 or 03 or 04 Hemi Magnum are based on the same basic block of the 1951 design, by which I mean that the new Hemi Magnum is not a "clean sheet" design. This is analagous to the fact that all "small block" Chevy V-8's, from the 256 cube of 1955 through the current Corvette LT-1, are also all the same basic block, though hardly the same engine.
Btw, both my Datsun (Nissan) 510's from back in the day sported engines, albeit 4 cylinder, with hemispherical combustion chambers.