No performance parts? What was Barney Navarro doing with this engine? You mean that nothing is commercially available, i suppose.
Navarro hot-rodded the 1964-up ("new") AMC six. That thing is the progenitor to the 4.0, and there's a fair amount of aftermarket for them.
The six I'm playing with is the old Nash design, that culminated in the 195.6 OHV that was the end of the evolutionary line. It shares nothing with the "new" AMC six, except the bellhousing pattern (until '72 when that changed).
I'd gladly stuff a "new" six in this car, except it's fully 10" longer and 6" wider and it would extend PAST the instrument panel in this car! The Rambler American prior to 1964 is a VERY SMALL car. With my palms on the steering wheel I can put my fingers on the windshield. Engine compartment is only 20" wide, 30" long.
