Fits 429 / 460 Ford Engines (Carbed 1968 – 1987 Cars / F-Series Trucks). BIG BLOCK FORD INTAKE MANIFOLD BOLTS (HEX). (10) 3/8" x 1 1/2" Hex Head Bolts (semi-polished). If clean, affordable, hardened OEM style fasteners is what you are after, then look no further!