6.4 392 cid. Guy told me that the 6.1 was a 392. He was a tried and true old school MOPAR man. I just let it go and we talked of years gone by and things that we were so much more familiar with. Dana 60s, six-packs, holleys and carters. They mean something to us but most young guys just look on with a glazed look. I have 2 sons 24 and 21 years of age, I try to keep up with todays lingo, YO. So I hope I never need an interpretor. I never want to lose out on the car talk.