Fitment for F22a1/4/6 and H23a1. Fabricated using 321ss material. Mild steel machined head flange. Originally designed for the CB7 accord but will fit nearly any chassis this engine is swapped into or comes originally. NOT ac compatible. Requires 1/2 size radiator. The billet collector is optional. Standard is a fabricated collector. These are built to order. Please allow 6-8 weeks for processing.