However, one of the biggest changes were a series of engine upgrades which included redesigned cylinder heads, now with a single intake and exhaust port for every cylinder, improved intake/exhaust manifolds, new camshafts and pistons and an all-new carburettor called the Rochester Varajet, as well as the fitment of electronic ignition. In total, these upgrades brought up to 25 percent more power and 15 percent better fuel efficiency. The engine block on these motors were painted a blue colour (as opposed to the previous red) and were commonly referred to as the "Blue" motor.