Spark Plugs & Gap
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Posting Guru
Joined: Sep 2008
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Spark Plugs & Gap
In a stock 351W for my year, the proper gap for my plugs is 0.044". However, my motor is not stock. I am using a mustang computer in the same block and added a blower (motor below).
My question is, does any of the above change what I should be using as the stock plugs and gap? The blower needs copper core plugs and I was advised to reduce the gap to 0.040" for the blower. I am running an MSD 6A box as well. Makes me wonder if I could go to a larger gap (0.042") since I have the MSD on there or what benefit that may have?
If anyone would school me on this, I'd appreciate it. I am replacing the plugs today so I have an opportunity to make a change.
My question is, does any of the above change what I should be using as the stock plugs and gap? The blower needs copper core plugs and I was advised to reduce the gap to 0.040" for the blower. I am running an MSD 6A box as well. Makes me wonder if I could go to a larger gap (0.042") since I have the MSD on there or what benefit that may have?
If anyone would school me on this, I'd appreciate it. I am replacing the plugs today so I have an opportunity to make a change.
Laughing Gas
Joined: Dec 2007
Posts: 959
Likes: 8
From: Imperial, MO
How much boost are you running? You'll want to decrease the gap as you increase boost in order to prevent blowout. What coil are you running with the MSD box? That will make a difference as well.
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