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never got the result I was looking for,

Joe was that a mileage app? If so I'll look for something as that is what I have (w 1406 Eddy) & if it's hurting me that bad & I dont know it I'll keep my eyes peeled for a cheap dual plane



2 of the cars I ran it on were daily driver MPG type builds, one was a 74 318 valiant with 2.76's and the other was a d150 shortbed with a 318/998 and 3.21's, on the valiant I switched to a sp2p with the same 600 carter and the d150 got a performer with a edelbrock 1400 600cfm carb.

The truck picked up 2 more mpg with 3.55's, small hooker headers and 2.25" duals and a really small crane hyd roller that was sold as an emissions legal cam, it already had #302 heads on it so I left them alone.