I have a mopar 318 that i just rebuilt. Quick build sheet, new pistons (flat top), new bearings all around, new cam (Summit 1789 .454lift and 272 dur), new lifters, new timing chain and gear set DUH, new used heads (1974 open chamber heads with hardened valve seats, old heads were junk), stock headers, offy dual port, holley brawler 600cfm 66 main jets. Anyways im getting close to 5mpg!?!? like wtf i WAS getting 10mpg with the same offy intake. before i hear it i know the offy dual port isnt...
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