If you Click Here at this chart of Buick Nailhead street cam recommendations, most people would not even be happy with the smallest because it wouldn't have enough or a lumpy idle. That is why Comp cams doesn't even make a cam for the Nailhead that isn't a "Thumper". To most the idle is everything, performance and drivability is secondary.
I don't have the specs on the cam I have installed, but it is a Schnieder close to the 262-70H one shown on that page. Won't have lump, but I it will be comfortable and affordable to drive.
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