Cylinder Head Gasket - 4.145 in Bore - 0.039 in Compression Thickness - Steel Core Laminate - Small Block Ford - Each Brand- FEL-PRO MPN 1006 . **NOTE: WARNING, CYLINDER HEAD REQUIRES SPECIAL MACHINING FOR RECEIVER GROOVES. RECOMMENDED FOR TURBO, NITROUS & SUPERCHARGED APPLICATIONS. Truck Freight- NO State Restrictions Canada Restrictions- NO Canada Shipping: Ships to Canada