(yoda voice) "Sometimes to the past look you must to the present understand")
Anyway, heres some tidbits from an interview Autweek did with Dan Knott, director of SRT.
"Start with the basics: Bore it out by three millimeter
s to up displacement from 5.7 to 6.1 liters (6.059 actually), bump the compression ratio to 10.3:1 from the standard 9.6:1, install a high-performance camshaft. It goes deeper than driveway hot-rodding, though, and not only because Chrysler can make the electronics work in concert even while keeping it legal in the eyes of the feds.
SRT improves the breathing with larger-diameter, hollow-stem valves and reshaped cylinder ports, fed by a new intake manifold (a thing of beauty under the hood that initially distracted us from the orange block) and steel-tube exhaust headers a quarter-inch larger in diameter than the exhaust manifold in the base Hemi. The SRT-8’s block is reinforced and boasts increased coolant flow,
the crankshaft is forged steel, the connecting rods are stronger powdered-metal forgings, the pistons run on floating pins and are cooled by oil squirters, the exhaust valves are sodium-filled, and the oil pan is modified for reduced foaming. With the stronger parts, the SRT version of the Hemi spins nearly 15 percent faster than the base model, putting redline at a respectable 6200 rpm (the electronic cutoff is at 6400) vs. the regular edition’s 5400 rpm. "
From here: http://www.autoweek.com/article.cms?articleId=100555
Another thing we've discussed is exactly what changes the "upgraded rear diffrential" gets over normal cars.
So heres' this bit, note mention of "beefed up halfshafts", which I had not seen in print anywhere.
" Knott also had to draw on corporate knowledge by finding AMG’s supplier of rear differentials and ordered up a part akin to that used on the mighty Mercedes-Benz E500 to couple to his beefed-up halfshafts."