Autolite AP26 Platinium

Autolite AP26 is a platinum spark plug for selected older American vehicles. The plug uses an M14 x 1.25 thread, tapered seat, resistor design and 0.045" / 1.14 mm preset gap.

Application / fitment

The plug is intended for selected GM, Ford, Lincoln, Mercury and Mopar applications requiring this thread, seat type and heat range. On older engines, compare the removed plug with the new part before installation.

• part type: spark plug
• selected Buick, Chevrolet, GMC, Oldsmobile and Pontiac applications
• selected Ford, Lincoln and Mercury applications
• selected Chrysler, Dodge and Plymouth applications
• selected GM V6 3.8 L and 4.3 L plus V8 305 / 5.0 L, 350 / 5.7 L, 400 / 6.6 L, 402 / 6.6 L and 454 / 7.4 L engines

Before installation, check cylinder head seat type, thread reach, required gap and ignition wire condition. Engines with modified cylinder heads or ignition systems should be matched to the specific setup.

Technical information

• part type: spark plug
• resistor type: yes
• center electrode: platinum tip
• ground electrode: nickel
• thread: M14 x 1.25
• thread reach: 0.431" / 10.95 mm
• seat type: tapered
• hex size: 5/8" / 16 mm
• preset gap: 0.045" / 1.14 mm
• resistor value: 4000 Ohm
• sale unit: 1 spark plug