Total Performance screw in freeze plugs as used in the 289, 302 BOSS, 302, 5.0L, 351, 5.8L, 400, 429 BOSS, 429 and 460 Ford blocks. Adding these will greatly increase the block's rigidity and end worries of press fit freeze plug popping out at hi speed or at some other inopportune time. Block MUST be tapped to install these(size is 1 1/4" NPT). Sold as a set of 6.

PART NUMBER: 100-101