Has anyone used mushroom lifters on a slant?
I found something in the old message board, but no real info.
Is there any advantage of using them on a slant, or is the lifters big enough as they are?
Where would the advantage be? 4x4 truck, or drag car?

Mushroom lifters are not necessary or advantageous on a slant-6. They're used in engines where the normal lifters are of a small diameter that won't ride on very tall (radical) camshaft lobes.