From what I learned on the Four Seconds Flat web page about spark plug reading, we would need a better photo of the side of the spark plug so we can see the color change on the threads of the plug. There should be a color change on the first 3 or 4 threads starting at the end of the plug. From what I can see you only have a color change on the first thread. http://www.4secondsflat.com/Spark_plug_reading.html
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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