What we have here is a good used Hogans custom aluminum Pro Stock or Super Stock dual quad, 4500 base opening high rise tunnel ram. Hogan is a company based in the heart of Nascar, Mooresville North Carolina. This particular manifold was built for a 572 cubic inch stroked Chrysler Hemi with Indy aluminum heads. This manifold was $3500 when it was custom made for that engine. The top of the plenum can be removed and used as a template to make another for whatever carb set-up you select. This intake will fit other Hemis. If you have any interest or questions please contact Jef at 56two 290 2222. No codes please. Thanks. Mopar.