Dyna Flow engine builders
I prefer Valco aluminum silcone to every brand I have ever tried. It looks good under the manifold and stays in place well. It is a different consistancy than GE based silicones.It sets up faster too.
As far as the clear silicone, I have one customer that uses it on his Blown Hemi engine for everything and it seems to hold up OK.
He uses it because you can buy it in the large 9 ounce tubes and squirt it out of a calking gun. It is much cheaper that way and he uses it in his Heating and Air Conditioning business anyway.
It does work if the surfaces are clean, just looks cheesy to me.