Museum of American Speed - Check out this 1934 Morton & Brett head for Modal A block. It features a two-port intake with 2 spark plugs per cylinder. | Facebook
DUAL SPARK PLUGS HAS BEEN AROUND FOR... - BEN Alameda Racing | Facebook
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Double the Spark, Double the Joy | ViaRETRO
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Double the Spark, Double the Joy | ViaRETRO
Why do some gasoline engines have 2 spark plugs per cylinder? - Quora
DELCO REMY 6 CYLINDER NOS DISTRIBUTOR WITH CAP Dual Plugs | eBay
Why Do Aircraft Engines Have Two Spark Plugs Per Cylinder? | Boldmethod
2 Spark plugs per cylinder 2004 - 2013 Dodge 5.7L V8 $ for tuneup spark plug replacement - YouTube
Dual ignition - Wikipedia
My New ST205
Dual Spark Plugs - F1technical.net
TWIN SPARK - WHY, HOW and why it isn't more widespread - YouTube
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Answers to Frequently Asked Questions About Spark Plugs
Two spark plugs per cylinder...good or bad? - Harley Davidson Forums
Double the Spark, Double the Joy | ViaRETRO
