New old stock Nippondenso W25EN spark plugs, set of eight for an engine.  These non extended tip plugs are meant to be used with high dome racing pistons which would interfere with standard spark plugs.  Heat range is same as a Bosch “4”.

This is not an original factory plug but fits and works perfectly with four cam heads and higher dome, high compression pistons without having to machine or modify the piston dome.  Any questions please message me on this item.