Modular Mustang Racing is proud to release its new line of Billet Main Caps for all Ford Modular Engines. Machined from Billet 7075 Aluminum these caps are not only 7 lbs lighter but yield a 23,000 psi tensile strength INCREASE over stock Nodular iron main caps meaning they can handle more power. The benefits dont end there, MMR has increased the side bolt size to a 7/16 to give greater stability! Includes New ARP Side Bolts. Priced at $399.99 set.