[Fot] Oil weights?

[Scott Janzen <s.janzen@comcast.net>]

I've been running 20-50 Brad Penn (high zinc) for the last season, but  
as I'm about to order some for the upcoming season, I'm wondering  
whether the engine really needs 20-50, as opposed to 10-40.  Used  
exclusively for racing, engine with fairly tight bearing clearances  
(when assembled).

Thoughts? 
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