- This week, we're bringing you an often overlooked muscle car, the 1968 Mercury Cougar GT-E. These were sporty but comfortable, and the GT-E bought you a 7-liter V8 to make things interesting. Most were the smooth 428 V8, but some were ordered with the far less subtle 427 side oiler... like the one in this video. The 427 was rated at 390 HP and has a great rumble, but the car is refined enough to drive and enjoy every day. The Brothers Collection is home to several rare Mercury cats, this is one of the favorites!