[Big Block Bill]

It looks like an intake that came on the LS-6 XAA part # 366250 engine that was available in the late 80's. If so I would say the casting date is May 20 1987. But that is only my opinion being I had 4 of these engines in my time playing with cars.

Drill out all the plugs, Bead blast it up, soak it overnight in simple green, wash it in water only, let it dry, then take a metal bowl and fill it half way with thinner, spray dull aluminum (Krylon) on top of the thinner, and brush it on the surface. Let it dry over night and it will look like new. You might have to do this more than once. Works great on anything aluminum. Great intake at a fair price IMHO. GLWS.

Bill