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Content > Engines & Driveline > Spark Plugs > Mustang Forum Australia - Mustang Tech

Spark Plugs


Choosing the right plug for your Mustang
The standard Windsor uses a plug with the following specs:
ReachHex SizeNGK Heat RangeThread Diameter
0.460"20.8mm (13/16")518mm

The NGK AP5FS fits the bill here.

Many aftermarket heads use a 0.750" reach plug such as the NGK FR5.
Check with your head manufacturer for the required specs.

Heat range cross reference table.
HEAT RANGECOLD ........................HOT
BRISK810 1214 1517
NGK1098765
DENSO 31272422 2016
BOSCH 2, 073, 08456, 78
CHAMPION55, 574, 596, 61, 63 7, 89, 1011, 12
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