Motorcraft SP-548 Spark Plugs

[Race Red Boss]

Hi All,

Just bought these and will be installing next spring when the Boss comes out of storage.

Interestingly, the in pkg. instructions say "Spark Plug gap is not adjustable". Looks like the gap is pre-set to around 0.052 or 0.053 range from what I can tell (I have silver dollar shaped type gap tool...harder to read). Owners manual says they should be gapped between 0.049 & 0.053

Guess I'll be installing them as is.

 

[me32]

Check each one. Should all be in the same range. Shouldn't be any huge variation in gap.

 

[Race Red Boss]

Check each one. Should all be in the same range. Shouldn't be any huge variation in gap.

Absolutely will. They ship each plug with a plastic tube covering the bottom of the plug to protect them from potentially changing the gap/getting damaged. Smart.