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Old 02-13-2018, 02:21 PM   #4
johnneilson
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Join Date: Jun 2010
Location: 34.22 N 118.36 W
Posts: 1,043
Default Re: Indexing Spark Plugs

Mark,

Good question, especially since you had the Lingenfelter Vette experience.

In my opinion, it is wasted effort in the Model A motor. The technology advances made in the last 60 or 70 years have proven that the original designs were not the most efficient.
The latest design combustion chambers has shown substantial increases in power and one factor is the placement of the spark plug along with C/R and chamber shape.

John
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