Primary size and length on SC engine

MidTexCuda said
Well this kind of stinks. My math: stock port opening at about -2.5" 1.75 primary = 2.14 x4=8.56 1.875 primary =2.46 x4=9.89 2.00 primary =2.84 x4=11.36 2.15 primary =3.14 x4=12.56 2.25 primary =4.15 x4=16.6 3.5 collector =9.08 (use 1.75 maybe 1.875) 4.0 collector =11.95 (use 2.0) 4.5 collector =15.20 (use 2.15) 5.0 collector =18.5 (use 2.25) does this look close? thus meaning run a min 1-7/8" tube or 2.0" tube to maybe a 3.5 collector but preferably a 4.0 collector.

(A)Your exhaust port opening needs to be in square inches.
(B)The inside diameter (measured in square inches) of the primary needs to be no smaller than the port.
(C)The collector inside diameter (measured in square inches) needs to be no smaller than 4 X the primary.

C = Bx4 "or greater"
B = A "or greater"
A = You need this measurement first.

NOW MY BRaiN HURT"S.