'73+ Poly Spool Big Block to Small Block Swap Down Kit

Easily replace your blown B/RB in an '73 & Up A,B,F,M,J-Body with a new or spare small block without changing your K-member. Our kits allow you to directly bolt a 273, 318, 340, or 360 onto your original B or RB K-member with no additional fabrication. Kit includes powder-coated brackets, polyurethane spool inserts, grade 8 bolt package.  Made in the USA!

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

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