TheseChampion made unitsare theperfectplugsfor your hot rod or original. The improved Copper Plus element offers better fuel burn and quicker starts. Go with the best.

• Superior performance and long lasting durability no other Plug comes close.
• Increased fuel burn and quicker starts with Champions Copper Plus element.

Specifications:
Thread Size: .551 inch (14mm)
Hex Size: .813 inch