AFFINITY PERFORMANCE PRODUCTS  FORD 20MM 2006-07 F BODY AND 2006-07 E BODY 6.0L NEW CYLINDER HEADS 

Build date January 16th. 2006 forward requies 20MM Dowels,

Note* Call 715-824-5051 to special order 20 mm dowels & head 

Heavy Duty / Better Built

To help avoid cracked castings - New Product

Ford 18MM 2003-04 F Body and 2003-04 E Body 6.0L New Cylinder Heads Late 2003 - 1.15.2006 Confirm Rocker Assembly Bolt Size NO CORE  Remember 18 to 20 MM Conversion Dowell Kit, an 18MM Will Fit in Place of a 20MM if it has the Late Rocker Assemblies and t