Reccommended Torque Specifications;
14mm Gasket Type Iron Heads 18-25 lb/ft Hand Tight 1/2 - 2/3 Turn
14mm Gasket Type Aluminum Heads 18-21 lb/ft Hand Tight 1/2 - 2/3 Turn
14mm Taper Seat Iron Heads 11-18 lb/ft Hand Tight 1/16 - 1/8
14mm Taper Seat Aluminum Heads 7-14 lb/ft Hand Turn 1/16 -1/8
For exact application please refer to the NGK Spark Plugs Catalog.
Always refer to your owner's manual and gap to manufacturer's specifications.
For SWAIT AIR BOAT Cadillac V-8 500 C.I.D. Engines, Perform the Following;
Swait's Air Boat Manual Require 8 Spark Plugs Copper NGK BP6ES or NGK BP5ES with Rating Gap .030
When adjusting the spark plug gap, do not pry the outer electrode against the center electrode. Use only the spark plug Specified here for your Cadillac 500 C.I.D. or higher. Using any other types may cause engine damage or loss of performance.
Turn off your engine, wait for engine to cool, disconnect metal battery cable if entering the propeller cage area. Note the order of the spark plug cables before disconnecting. If you are not sure, tape and number each first. Unfasten the connector by pulling straight up. Pulling on the cables may break the carbon conductor inside. Unscrew the old spark
plugs with a spark plug wrench (NOT INCLUDED) and remove them. CAUTION: The boots of the spark plug may be hot, so be careful!!! Do not allow dirt or anything else to fall inside the spark plug holes.
Check the gap on the new spark plugs by passing the feeler gauge (NOT INCLUDED) between the electrodes on the spark plug. If the gap is correct, you will feel a slight drag. If necessary, bend the outer electrode to obtain the right clearance. Screw in the plugs by hand as far as they will go. If necessary you may use a spark plug wrench for an extension. If a plug does not screw in easy, remove it and try again to ensure the threads on the spark plug with the threads in the hole, in order to prevent the threads from stripping.
Tighten the plugs with a spark plug wrench, but do not over tighten. Make sure spark plug cables are installed in the correct order. The connector fastens on by pushing it squarely over the spark plug end.
PART # BP6ES & BP5ES
MADE IN JAPAN
