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A complete set of core (freeze) plugs for one Ford Crossflow 691M/711M block or Lotus Twin Cam 701M block. Core plugs seal the casting holes in the block and are a common source of slow coolant leaks on older engines, so it is good practice to replace the whole set at every rebuild.
Lotus Twin Cam cylinder head core plugs are not included (FRP part numbers FL850 and FL851).
