The Quote AndyF about the headers, "I think those are 1 3/4 Schoenfeld sprint car headers but I bought them a long time ago so I'm not positive.'
As far as more cam and lift, I think that is kind of the conclusion that they are thinking. This engine is for a street car, so a good cam for it. That said, Blueprint is getting 445 HP/500 Torque with Eddy's and a flat tappet, and ATK is getting 465HP/535 torque with a similar hydraulic roller with Eddy's for comparison.
