ITs on page 18, Feb issue.
580 HP
560 TQ
Variable Valve timing (I was criticised here for suggesting that, some months ago! And now its a reality!)
Boosted compression from 9.6 to 10.2, with 8.4 liters.
Has some free breathing tricks, no crossover pipe, special (and bigger) valves, plenum and header refinements.
Body looks the same, except for the three deep cooling scoops on each side of the hood, just adjacent to the stripes, and inboard of the fenders.
Twin disk clutch, with 18% less rotating mass.
New Tremec TR6060 tranny, with three synch cones on 1st and 2nd, two cones on the rest. (Up from two cones on 1st and 2nd, one on the rest, on the T56.)
Diff by Dana, fitted with a "GKN speed-sensing viscous-couped limited slip", said to improve response to changes in traction.
*****Vette haters read no further*****
Viper now has 5.91 pounds/HP, verses the coming 650HP Corvette SS' Enzo-like 4.76 pounds/HP, (based on the current ZO6s' 3100# weight, and the weight has been said to be even less on the SS. But I can't believe their target weight of 2900#, sounds impossible. IF true, that would result in 4.46 #/HP, which is hyper-exotic territory)