I'm just pointing out to the people who claim the modem Hemi is not a Hemi. Well it is as much as the old one was, it's an opposed valve motor from Mopar just taking what they learned over 50 years and making it better.
From Wikipedia:
"Main article:
Chrysler Hemi engine
Perhaps the most widely known proponent of the hemispherical chamber design is the
Chrysler Corporation. Chrysler became identified primarily by trademarking the "Hemi" name and then using it extensively in their advertising campaigns beginning in the 1960s. Chrysler has produced three generations of such engines: the first (the
Chrysler FirePower engine) in the 1950s, the second (the
426 Hemi), developed for
NASCAR in 1964 and produced through the early 1970s, and finally the "new HEMI" in the early 2000s. The "Hemi" engine introduced in 2002 by DaimlerChrysler had a combustion chamber featuring valve and twin spark plug locations markedly different from the second generation 426ci version. The current-production "Hemi" V8, with its pinched chamber, DOES NOT HAVE TRUE HEMISPHERICAL CHAMBERS despite the name; rather, it bears a closer resemblance to the mid-1950s
polyspherical chamber, which Chrysler engineers developed as a lower-cost alternative head for their
V8 engines. The polyspherical head needed less metal and was narrower due to using only one rocker shaft. This saved costs in material, space, and warranty claims and allowed it to be used in smaller vehicles. Chrysler's Australian-market
Hemi-6 of 1970-80 had partial-spherical hemi chambers, though they were only 35% of a sphere."
From Popular Hot Rodding:
Cylinder Head:
"The advantage of a hemi design of combustion chamber is that the valves (and most importantly the intake valve) are always moving away from the shrouding effect of the cylinder walls (Fig 2) as they lift off the seats. However, the new hemi IS NOT ACTUALLY A TRUE HEMI as per its 426-inch predecessor. The hemi style of combustion chamber was put to good use during WWII when the output of supercharged aero engines could basically decide the fate of nations. For a two-valve combustion chamber, the hemi layout not only allows the largest valves to be accommodated but also to have the highest flow efficiency. The downside of a true Hemi configuration is that it does not respond well to a high compression ratio that inevitably requires a combustion-inhibiting, high-domed piston. For an engine with a typical bore/stroke ratio, this means it works great with a supercharger and CRs less than 8.5:1, but not as a normally-aspirated unit with 10:1 or more. To get around this problem the new Hemi has the sides of the true hemi form filled in. With the two spark plugs it is equipped with, this allows all the advantages of a true hemi, including blower capability, along with the ability, if required, to successful utilize high compression ratios."
I can keep going and going and going. They each have their ups and downs, but the new Hemi is NOT a true hemi engine. Period.
Oh and powdered rods SUCK nasty, bug infested rotten dead camel buttholes. They are weak and subject to failure. It is a common failure in the new "Hemi".