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MSD Iridium Spark Plug 3720

MSD Iridium Spark Plug 3720
$14.99 ea
NEWOUT OF STOCK
Model: 4017178
Select a Vehicle or refer to the Vehicle Fitment Tab below to verify that this part fits your vehicle.
STANDARD
DELIVERY
MSD's spark plugs are engineered to improve the efficiency of the combustion process to create the most power possible combined with increased durability. The center tip of the plug is made from iridium to promote the best spark and increase resilience. A proprietary ceramic material enhances the dielectric strength of the plug housing forcing the spark, even under extreme cylinder pressures, to jump across the plug gap to the ground electrode. This electrode is machined to expose more spark to the incoming gases to promote the most effective combustion event possible.
Features:
  • Proprietary plug design inside and out
  • Designed for use on high performance vehicles that utilize high output ignition systems
  • Machined electrode increases exposure to the flame to improve combustion
  • MSD’s proprietary ceramic formula provides the highest dielectric strength
  • Yttrium ground electrode reduces the chance of pre-ignition
  • Iridium tip improves cold starts
  • All spark plugs tested prior to packaging and shipping
  • Unique insulator design improves spark isolation
  • Lower voltage Requirements for longer coil life
About MSD Ignition

Racers never stop experimenting as they search for every way to wring out more power or handling performance to to gain an edge over the competition. The team at MSD is no different as we strive to deliver the products you  need to meet your performance goals. We continue to innovate and invent components and technology that deliver  performance and reliability with products that are easy to use and install. 

Over the course of 40-plus years, MSD Performance has been driving the development of innovative components  that helped shape the way our cars race and perform. From super speedways to road courses, land speed racing to  top fuel dragsters, and of course your traditional hot rod, MSD has provided the components to fire nearly anything in  motorsports.

MSD was the first company to develop and offer the multiple sparking, capacitive discharge ignition for engines. The line of MSD 6-Series Ignitions are the most popular aftermarket ignitions in the world due to our race-proven performance on the track and our reliability on the street!

Early on, MSD focused squarely on ignition systems with revolutionary products like the multiple sparking CD ignition, timing and rev controls, billet aluminum distributors and the Pro-Mag, an incredible breakthrough in power  and endurance. 

Today MSD is developing electronics for your entire powertrain. The Atomic EFI systems for the LS engine platform and throttle body are now complemented with a transmission controller. Our DynaForce Starters and Alternators  ensure that your engine cranks over to fire up and the Alternators keep it charged. MSD is poised to deliver components that work and communicate together to provide performance and value.

Videos:

Vehicle Fitment:

The Vehicle Fitment Guide is to be used as a general reference. The data has been provided by our suppliers and manufacturers and may contain errors or incorrect data. Always refer to a professional to verify correct fitment for your vehicle.
Make Model Submodel Years Engine Fitment Notes
Chevrolet Bel Air Base 1972 6.6L / 402 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Bel Air Base 1981 5.0L / 305 / V8
4.4L / 267 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Bel Air 1971 5.7L / 350 / V8
6.6L / 400 / V8
6.6L / 402 / V8
4.1L / 250 / L6		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Biscayne 1971 6.6L / 400 / V8
5.7L / 350 / V8
4.1L / 250 / L6
6.6L / 402 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Brookwood 1971 5.7L / 350 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Base 1986 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Base 1987 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Base 1988 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Base 1989 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Base 1990 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Base 1991 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Base 1992 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic Brougham 1986 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic Brougham 1987 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic Brougham 1988 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic Brougham 1989 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic Brougham 1990 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic Estate 1977 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic Estate 1978 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic Estate 1981 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic Estate 1982 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic LS Brougham 1987 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic LS Brougham 1988 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic LS Brougham 1989 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic LS Brougham 1990 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic LS 1993 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic LTZ 1991 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic LTZ 1992 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic Landau 1977 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic Landau 1978 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic Landau 1979 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic Landau 1980 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic Landau 1981 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic Sport 1979 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic Sport 1980 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic 1977 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic 1978 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic 1979 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic 1980 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic 1981 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic 1982 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic 1983 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic 1984 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic 1985 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic 1986 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic 1987 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic 1988 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic 1989 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic 1990 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic 1991 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic 1992 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice Classic 1993 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice 1971 5.7L / 350 / V8
6.6L / 400 / V8
6.6L / 402 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice 1976 5.7L / 350 / V8
7.4L / 454 / V8
6.6L / 400 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice 1977 5.7L / 350 / V8
5.0L / 305 / V8
4.1L / 250 / L6		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice 1978 5.7L / 350 / V8
5.0L / 305 / V8
4.1L / 250 / L6		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice 1979 5.7L / 350 / V8
5.0L / 305 / V8
4.1L / 250 / L6		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice 1980 5.7L / 350 / V8
4.4L / 267 / V8
3.8L / 231 / V6
3.8L / 229 / V6
5.0L / 305 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice 1981 4.4L / 267 / V8
3.8L / 231 / V6
3.8L / 229 / V6
5.0L / 305 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice 1982 4.4L / 267 / V8
3.8L / 231 / V6
3.8L / 229 / V6
5.0L / 305 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice 1983 3.8L / 231 / V6
3.8L / 229 / V6
5.0L / 305 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice 1984 3.8L / 231 / V6
3.8L / 229 / V6
5.0L / 305 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice 1985 5.7L / 350 / V8
3.8L / 231 / V6
4.3L / 262 / V6
5.0L / 305 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice 1986 5.7L / 350 / V8
4.3L / 262 / V6
5.0L / 305 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice 1987 5.7L / 350 / V8
4.3L / 262 / V6
5.0L / 305 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice 1988 5.7L / 350 / V8
4.3L / 262 / V6
5.0L / 305 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice 1989 4.3L / 262 / V6
5.0L / 305 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice 1990 4.3L / 262 / V6
5.0L / 305 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Caprice 1991 5.0L / 305 / V8
Chevrolet Caprice 1992 5.0L / 305 / V8
Chevrolet Caprice 1993 5.0L / 305 / V8
Chevrolet Impala Base 1977 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala Base 1978 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala Base 1979 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala Base 1980 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala Base 1981 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala Base 1982 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala Base 1983 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala Base 1984 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala Base 1985 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala Custom 1977 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala Estate 1981 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala Estate 1982 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala Landau 1977 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala Landau 1978 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala Landau 1979 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala Sport 1979 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala Sport 1980 5.0L / 305 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala 1971 6.6L / 400 / V8
6.6L / 402 / V8
4.1L / 250 / L6
7.4L / 454 / V8
5.7L / 350 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala 1976 6.6L / 400 / V8
7.4L / 454 / V8
5.7L / 350 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala 1977 5.0L / 305 / V8
4.1L / 250 / L6
5.7L / 350 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala 1978 5.0L / 305 / V8
4.1L / 250 / L6
5.7L / 350 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala 1979 5.0L / 305 / V8
4.1L / 250 / L6
5.7L / 350 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala 1980 5.0L / 305 / V8
4.4L / 267 / V8
3.8L / 231 / V6
3.8L / 229 / V6
5.7L / 350 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala 1981 5.0L / 305 / V8
4.4L / 267 / V8
3.8L / 231 / V6
3.8L / 229 / V6
5.7L / 350 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala 1982 5.0L / 305 / V8
4.4L / 267 / V8
3.8L / 231 / V6
3.8L / 229 / V6
5.7L / 350 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala 1983 5.0L / 305 / V8
3.8L / 231 / V6
3.8L / 229 / V6
5.7L / 350 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala 1984 5.0L / 305 / V8
3.8L / 231 / V6
3.8L / 229 / V6
5.7L / 350 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Impala 1985 5.0L / 305 / V8
4.3L / 262 / V6
3.8L / 231 / V6
5.7L / 350 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Townsman 1970 7.4L / 454 / V8 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;
Chevrolet Townsman 1971 6.6L / 402 / V8
6.6L / 400 / V8
5.7L / 350 / V8		 Iridium Tip Spark Plug; Single; Plug Type 6IR4Y; [Available While Supplies Last];0.035 in. Plug Gap;

Specifications:

Emission Code 2
Heat Range 4
Hex Size 5/8
Length Standard
Part Type Spark Plug
Plug Style Code 6IR4Y
Product Type Spark Plug
Projected Tip Yes
Proposition 65 www.P65Warnings.ca.gov
Quantity 1
Reach 0.4375
Resistor Yes
Seat Type Tapered
Style Iridium
Thread Size 14mm
Warranty Limited 1 Year Warranty

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