new slant build cam choice help please
Well, 252 is way too much duration for my motor
Doubt it. That's Comp's "one baby-step above stock" cam offering. 252° is its
advertised duration. Its duration at 0.050" is 215°. But I still don't recommend it.
I am curious about the Comp cam I DO have, wondering whether I should chance it
Well, it is a bird in the hand. But it looks like
this one, (264° advertised duration). I don't think it's what I'd want to use on a turbo motor—its lobe separation looks kinda close to me; you don't wanna be blowing your boost
through the cylinder and out the exhaust pipe while both valves are open. But that's just general principle; I've not built a turbo slant motor, so I'm not the right guy to make a specific cam recommendation for one.
not knowing anything about the rear cam journal machining (how was it wrong?)
Oil passages not drilled to line up with oil-in and oil-out holes in the rearmost cam bearing. See
here (and while you're at it, see
here)
and the metalurgy(?) problem with the distributor/oil pump drive gear. I don't know what to look for.
It's not necessarily something that can be seen by just picking up a cam and eyeballing the worm gear. Sometimes (as described in the last post of
this thread) but sometimes not. Best insurance seems to be avoiding the faulty-cam-blank gamble altogether, and instead sending a known-good original cam to Oregon Cam (or another camshaft house) for regrind to your specs or theirs of your choosing
