Crater Maker Dimple Die Set - 4 Piece Option:Dies only It's up to you whether

It's up to you whether to port match your heads to these flanges

Can be used for other applications

Critical Fitment Note:

fixtured and TIG welded (core required)

our blocks are built to withstand the rigors of exhaust fabrication

Crater Maker Dimple Die Set - 4 Piece Option:Dies only It's up to you whetherThese are the best quality made in the USA dimple dies available. These four crater maker dies are CNC machined from 4140 alloy steel, heat treated for hardness, Sizes are #10, 1 4", 5 16" and 3 8". The #10 uses a dowel pin to align the dies while the others use threaded bolts. The 5 16 and 3 8 bolts can be used to draw the dies together however this hardware is not meant to last forever. We recommend using the provided hardware as alignment pins or