IMO, the E-Street heads are a good bang for the buck. If your not expecting to set the world on fire they are a nice upgrade from the factory cast iron head. I built a real mild motor with them, +.030 440, 9.2-1, MP .528 mechanical cam, 1-3/4" pickup headers. With an M-1 single plane and a 750 Edelbrock carb it made 455hp&508ftlbs, with a Weiand TunnelRam and 2- 750 Edelbrocks it made 469hp&542ftlbs.
