Spark Plugs
October 11th, 2009, 01:58 PM
#1
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Join Date: Feb 2009
Posts: 2,257
Spark Plugs
I wanted to tell everyone about my experience with spark plugs.
I have tried NGK, Champion, Accel, AC Delco, and Autolite plugs in my 70 442 with a 455.
Out of all the plugs tried, the Autolite Platinum #85 worked the best. The engine idled and ran best with them.
The AC Delco RapidFire plugs also worked well, but are more expensive.
My ignition combo:
Factory distributor recurved, with a Pertronix Ignitor
Pertronix coil
Taylor wires
Blur Streak car and rotor
Autolite platinum plugs
Works great.
I have tried NGK, Champion, Accel, AC Delco, and Autolite plugs in my 70 442 with a 455.
Out of all the plugs tried, the Autolite Platinum #85 worked the best. The engine idled and ran best with them.
The AC Delco RapidFire plugs also worked well, but are more expensive.
My ignition combo:
Factory distributor recurved, with a Pertronix Ignitor
Pertronix coil
Taylor wires
Blur Streak car and rotor
Autolite platinum plugs
Works great.
October 12th, 2009, 08:37 AM
#4
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Join Date: Nov 2007
Location: Rathdrum, Idano
Posts: 9,127
Edelbrock heads require a 14mm x 3/4" reach gasketed spark plug and depending on application the heat range will vary from Champion RC-9YC to RC-14YC or equivalent. RC-12YC is recommended for street use
The MDS Box will give you a hotter spark and you will have to increase the plug gap (the MDS directions give you the perimeters for the gap
October 12th, 2009, 03:02 PM
#5
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Join Date: Jul 2009
Location: Beachwood, NJ
Posts: 1,468
Edelbrock heads require a 14mm x 3/4" reach gasketed spark plug and depending on application the heat range will vary from Champion RC-9YC to RC-14YC or equivalent. RC-12YC is recommended for street use
The MDS Box will give you a hotter spark and you will have to increase the plug gap (the MDS directions give you the perimeters for the gap
The MDS Box will give you a hotter spark and you will have to increase the plug gap (the MDS directions give you the perimeters for the gap
So the plugs I need are a metric thread? Or the Champion RC-12YC is what I need? I have Accel in there now that I got when I bought the heads but am not happy with them.
October 12th, 2009, 04:36 PM
#6
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Join Date: Nov 2007
Location: Rathdrum, Idano
Posts: 9,127
Correct on the thread. They do not have to be champion, you can cross reference to any brand. If its a street driver the just go with the equivalent to the champion RC-12YC in your prefered brand
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