RE: Model for a Jett 120 Big Block
i have one just ran in the big pipe and 90 pipe.
13x13N long pipe 10,800
13x8 90 pipe 12,900
13x11 90 pipe 10,400
mine does not seem very strong
i will run my 120 AX but i think i got 11,300 on the 13x11 with muffler