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Edlebrock RPm heads, Vortech - what autolite plug?

322 Views 5 Replies 4 Participants Last post by  Frank n Sons
We have been using, as per Edlebrocks suggestion, Champion RC12YC plugs in 3070 with no problems. We have now added a blower to the car and have been told by Vortech that we will need a one range colder plug. I'd like to go with Autolite. The RC12YC Champ plugs = AR3924 Autolite. The question is: Is the Champ RC9YC one step colder? It cross-refs to Autolite AR3923 which sounds right as it is one number less than stock. Anybody? Bueller? Bueller?

Frank n Sons.
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With the blower use an Autolight 3922.
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