GMC C25/C2500 Pickup Tornado Fuel Saver

E3 DIAMONDFIRE SPARK PLUG, SOLD INDIVIDUALLY -- 14 mm thread size, 19 mm reach, 0.81 in. hex size, gasket seat, resistor, 1.016 mm non-adjustable gap size, copper core electrode material, nickel alloy electrode tip material, projected insulator type; Guaranteed to provide more power while using less fuel, quicker starts and less fouling than competitive standard spark plugs.

Fits the following 1966-1969 GMC C25/C2500 Pickup submodels:

• 1969-1969: Base; 8 Cyl 6.5L;
• 1966-1969: Base; 6 Cyl 4.1L;

• 1966-1969: Base; 6 Cyl 5.0L;

• 1966-1966: Base; 6 Cyl 3.8L;

Fits 2 more submodels. (Show all) Show less info

E3 DIAMONDFIRE SPARK PLUG, SOLD INDIVIDUALLY -- 14 mm thread size, 11.17 mm reach, 0.62 in. hex size, tapered seat, resistor, 1.016 mm non-adjustable gap size, copper core electrode material, nickel alloy electrode tip material, projected insulator type; Guaranteed to provide more power while using less fuel, quicker starts and less fouling than competitive standard spark plugs.

Fits the following 1970-1974 GMC C25/C2500 Pickup submodels:

• 1973-1974: Base; 8 Cyl 7.4L;
• 1972-1974: Base; 8 Cyl 5.7L;

• 1970-1974: Base; 6 Cyl 4.1L;

• 1972-1973: Base; 8 Cyl 5.0L;

• 1970-1972: Base; 8 Cyl 6.6L;

Fits 3 more submodels. (Show all) Show less info

E3 DIAMONDFIRE SPARK PLUG, SOLD INDIVIDUALLY -- 14 mm thread size, 11.17 mm reach, 0.62 in. hex size, tapered seat, resistor, 1.016 mm non-adjustable gap size, copper core electrode material, nickel alloy electrode tip material, projected insulator type; Guaranteed to provide more power while using less fuel, quicker starts and less fouling than competitive standard spark plugs.

Fits the following 1970-1974 GMC C25/C2500 Pickup submodels:

• 1970-1974: Base; 6 Cyl 4.8L;
• 1971-1971: Base; 6 Cyl 4.1L;

• 1971-1971: Base; 8 Cyl 5.0L;

• 1971-1971: Base; 8 Cyl 5.7L;

Fits 2 more submodels. (Show all) Show less info