Fred, Yes its legal to trim and notch the k frame for NHRA S/S like i posted earlier, take a closer look at some of the fastest Legal SS/A cars

K frames can be done in different styles, from mild to wild. depends what the customer wants




not sure how a 6 cyl. k frame would be any lighter
all k members are the same (6 cyl. or V8), just different motor mount configurations.

Bondo