Spark Plugs

Pontiac V8 Spark Plugs

Sorted by Head — Spark Plugs for Pontiac V8s

Spark plugs for a Pontiac V8 are not one part number with a heat range on the end. Pontiac changed the plug seat in 1972, and Edelbrock aluminum heads use a different reach again, so the same engine with three different sets of heads takes three different plugs.

Butler carries the NGK line split into three groups by cylinder head: 1971 and earlier cast iron, 1972 and later cast iron, and Edelbrock aluminum. Each group runs a spread of heat ranges in extended tip and recessed tip so you can match the plug to the combination.

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Plugs for 71' and Earlier Cast Iron Heads

Pontiac V8 Plugs for 71' and Earlier Cast Iron Heads Gasket Seat, Short Reach — Plugs for 71' and Earlier Cast Iron Heads for Pontiac V8s Pontiac cast iron heads through 1971 use a...More Details »

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Plugs for 72' and Later Cast Iron Heads

Pontiac V8 Plugs for 72' and Later Cast Iron Heads Taper Seat — Plugs for 72' and Later Cast Iron Heads for Pontiac V8s From 1972 Pontiac cast iron heads went to a 14mm taper...More Details »

Plugs for Edelbrock Aluminum Heads

Pontiac V8 Plugs for Edelbrock Aluminum Heads Long Reach — Plugs for Edelbrock Aluminum Heads for Pontiac V8s Edelbrock aluminum heads on a Pontiac V8 take a 14mm gasket seat...More Details »

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More About Spark Plugs

1. Find Your Head First

Three things separate the groups, and getting any one of them wrong means the plug either will not seal or will stick into the chamber where it does not belong.

1971 and earlier cast iron	13/16" hex, 14mm gasket seat, 3/8" reach. The plug carries its own crush washer and the hex is the large one your old plug socket fits.
1972 and later cast iron	5/8" hex, 14mm taper seat, .460" reach. A taper seat plug has no gasket and seals on the cone, so it is not interchangeable with the earlier gasket seat plug even though the thread is the same.
Edelbrock aluminum	5/8" hex, 14mm gasket seat, 3/4" reach. Gasket seat like the early iron heads but twice the reach, which is why an iron head plug is wrong in them.

2. Heat Range

Heat range is how fast the plug sheds heat out of the firing tip, and on NGK numbering a higher number is a colder plug.

The spread Butler stocks	Heat ranges 6 through 9 in the early iron group, 5 through 9 in the later iron group, and 5 through 10 for Edelbrock aluminum.
Read the listing, not the habit	Butler flags the nitrous parts inside each family, and those are the ones to avoid unless the car actually runs the bottle. Too cold a plug on pump gas simply fouls.

3. Tip Style and Resistor Type

Two smaller choices sit on top of head type and heat range.

Extended tip	Puts the electrode further into the chamber. Common on street combinations across all three groups.
Recessed tip	Keeps the electrode inside the shell. The choice when a piston, a valve or a dome does not leave room for a tip to hang out into the chamber.
Resistor type	Resistor plugs are stocked in the later iron and Edelbrock aluminum groups, and they are worth having when the car runs a radio, an ECU or any other electronics you would rather not feed interference.

If you are running Butler-built heads or anything other than these three families, call before you order. It is a cheap part to get right and an expensive one to get wrong.

Plugs for 72' and Later Cast Iron Heads Plugs for Edelbrock Aluminum Heads

Not sure what your Pontiac needs?

Call our tech team at 866-762-7527. Tell us your engine, heads, car, and power goal, and we will put the parts together as one combination that works.