'73+ A,B,F,M,J-Body Big Block Mopar to Small Block Swap Down Kit

Easily replace your blown Big Block 383, 400, or 440 in your '73 & Up A,B,F,M,J-Body with a Small Block without changing your K-member.  Our kits allow you to directly bolt a 273, 318, 340, or 360 onto your original Big Block K-member with no additional fabrication. Kit includes powdercoated brackets, polyurethane spool inserts, grade 8 bolt package.  Made in the USA!

Big Block K-Member to 273/318 Kit - 73PB-318

Big Block K-Member to 340/360 Kit - 73PB-340