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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
They both good cams for mildly modded motors with stock heads. People claim the E Cam works SUPER with any kind of forced induction. I ran a B cam with a 150 shot for a while and it seemed to run really strong.
The only real difference between the two is the idle quality. The B will "Lope" slightly than the E
E's give you more torque lower in the RPM band, B's give you more HP in the higher RPM band. If your car is your daily driver, you're better off w/the E, since you'll use and feel the low-end torque more than you will the high-end hp, unless you redline every shift, then you might want the high-end HP. Cars used primarily for racing are more suited w/the B cam.
It sounds like the "E" is better suited for me. I don't race my car and it would improve my low grunt. I have a 5-speed. High end power doesn't do me alot of good on the street.