Another 440 Source item you won't find anywhere else... Shown here is our Brass Early Disc Style Plug kit. Used on all big block Mopar engines from their introduction in 1958 until 1962, these conical "discs" are secured in the block by tapping them in the center which causes them to expand. These kits include EVERY plug you will need for the engine, including the engine block, cylinder heads and camshaft plug.