As an Amazon Associate, we earn from qualifying purchases. 4.6L / 5.4L 4V Stage 4 Competition CNC Porting Package Modular Head Shop . 4V-STG4CNC Gallery Attributes Brand name, Manufacturer name, ManufacturerModular Head Shop ConditionNEW Extra Product Name4.6L / 5.4L 4V Stage 4 Competition CNC Porting Package keywordsmhs, modular head shop, 4v, cobra, mach 1, navigator, stage 4, cnc, porting, ported, heads, package, cpmpetition, moq, multiple, tierMinQty11 MPN4V-STG4CNC qtyInStock-2 qtySourceFieldMap SKUMHS-4V-STG4CNC snippetModular Head Shop Stage 4 CNC Porting Package for 4V Cylinder Heads. Includes Stage 4 CNC Porting / Chamber Program, Bronze Guides, Oversize Valve Seats, Manley +1mm Stainless Valves, PAC RPM Series Springs and Retainers, Competition Valve Job and professional assembly. tierPrice14299.00 Distributor offers SellerSKUMOQIn stockMultiplePrices modularheadshop.comMHS-4V-STG4CNC1-211 @ $4299.00