Ram 392 Quick Silver Concept First Test - Truck Trend Here is a link to a recent test drive of the Quick Silver Ram with the 6.4L 392. It's numbers seem pretty good, these Hemi's are catching up. But look at what it would cost to build one your self not cheap. You could buy 2 or 3 Viper trucks for that price. The part I do like is if you wanted to build your own SRT the author suggest the new 7.0L 426 Hemi crate motor at 540 HP, only $17,000.00. Pretty cool.