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    426 HEMI: switch from Valvoline to Rotella T or ??

    I'm concerned about lack of zinc in oil for my 70 Challenger w/ a 500 HP 426 Hemi. ITs got a flat tappet cam w/ Hydraulic lifters. I'm using Valvoline 10/40 now. Should I switch to Delo or Rotella T to get more zinc? WIll bearing clearances be an issue when changing from 10/40 to 5 or 15/40?? I...
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    Best oil for 70 426 Hemi???

    THe breakin is almost done on my rebuilt 426 Hemi Challenger & I'm running Valvoline 10/40. Its 10:1, Diamond pistons, Manley rods, Kellog crank, ported Iron heads & has the best in bearings, rings & machine work. I've been told after 5K miles, to run synthetic, but think dino oil is best. What...
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