Not Ranked
I got some tech advice from Joe Gibbs. I sent them my bearing clearances which are < .001 per 1" main journal dia (e.g. tight), so for the aluminum 427w their recommendation is HP-4 after break-in with BR. So that's the plan, they also recommended during break-in I don't baby it and put the 427 under a good load to get those rings really seated.
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