I have a 96 Z28 that has the LT1 with cold air intake, comp cam 306, magnum tip rockers, rods, and valve springs that are all comp cams and are neccesary to run the cam. I got it dyno tuned and it doesn't even hit stock RWHP, it dyno'd at 267. The guy told me that the car cannot breath and I need some headers and maybe even injectors. I have a single flowmaster exhaust. I think I just need to put on my Edelbrock shorty headers and it should open up and maybe even a dual exhaust because the single could create too much back end. I need suggestions Thnx. Michael

 

ANY kind of headers should put your rwhp over 300. Those manifolds are wayyyy too small for a cam of that size.