Yes, the E has a different valve, much heavier hammer and a different hammer spring.
Does the "E" have the same valving as the FAC Classic & Carbine and just a different spring to get the extra few fpe?
Yes, the E has a different valve, much heavier hammer and a different hammer spring.
You can get upto 40ft/lbs out of an S400 (.22) with the standard valve and a (slightly modified) hammer.