We now offer a kit to replace the freeze plugs in factory iron big block Mopar heads. These are made from brass, which offers a big upgrade in corrosion resistance from the factory steel plugs. This kit includes four large and four small plugs, enough to do one complete engine (two cylinder heads.) Fits all 1963 and later big block Mopar applications, such as cylinder head casting numbers:
2406516
2780915
2843906
2951250
3462346
3751213
3769902
3769975
4006452