331 Dyno #'s Dead @ 5100 RPM (Long)

[Fox-4-Cobra]

You might be right!

I cant figure out what else could be causing it, the engine starts dropping HP drastically. The tuner said he thought the MAM, TB, GT-40 Irons and Cobra upper and lower were to restrictive for the extra cubes. I had always read that the aforementioned parts were good to atleast 5600 RPM even with the extra stroke. I figured they would be a limiting factor but not to that extent.

Can anybody think of anything I might have missed. The springs were new and good to .600 lift. It has #24lb injectors so it's not starving for fuel. The E-Cam, heads, TB & MAM sizes work well together and should make peak at 5600 on a 5.0. I have seen and read about stock long block 94-95 Cobra's with similar set ups (Cam, Exhaust,GT-40's 3 angle & Surfaced) getting better numbers. I did not expect over 300 RWHP but thought the extra stoke and slightly higher CR would net around 270-290 RWHP and 310-325 RWTQ.