Zinc is still a good idea in a HP engine, good oil is good oil. We ran the VR1 in that engine, 20w50. I break-in and run almost all my engines with that. Later he can run like a Dominator 10w30 and pick up another 10hp or so.
I asked because I went from 20W-50 to 10W-30 in the 416 and didn't like the 20 PSI hot idle pressure I was getting but did like the way the engine wasn't so darn cold blooded at cold start/idle. Next try will be Rotella T3 15W-40 and I was wondering if with that 560 HP Voodoo cam and these lifters if I could get away from the zinc.
