Think of stock as shorties. Aftermarket shorties are a small improvement of flow and sound, but they collect into one tube right after leaving the heads. Long tubes have the single tubes running much further before collecting into a single tube, which is less restrictive. All mods will benefit from long tubes.
Chevy runs deep, don't step in Chevy.
chevy runs deep, Don't step in chevy!
67 Coupe 289 - TCI C4 w/2k stall; Holley 4150 570cfm; Performer intake; mild cam; Pertronix HEI; 302 heads; Roller Tips; Hedman Tri-Y headers; H-pipe w/Flowmaster 40's; 9 in posi 3.50; 205/50-17F; 225/50-17R.