Brand ngk part name spark plug part number 4055 technical specification spark plug 1 earthed electrode outer thread mm 14 0 thread length mm 19 spanner size 20 8 mm spark position mm 3 5 spark plug interference suppression 5 kohm spark plug iridium middle electrode spark plug unscrewable sae connector spark plug with gasket seat this part fits with the following models aston martin v8 coupe 5 3 69 93 340 5340 aston martin v8 coupe 5 3 69 93 511 5340