spark plugs
#1
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spark plugs
I am in the process of working on a 1973 440 with 400/440 motorhome heads, I am having trouble finding spark plugs for this engine. I have already tried Champion RJ12YC and Autolite AP85 with no luck. The threads are good on the heads. I have heard that these heads take different spark plugs. PLEASE HELP
#2
Mopar Lover
Join Date: Nov 2007
Location: New Jersey
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What is the reach on the head for the plug, is it 3/8 or 3/4? I had Accel 437s for the stock 440 heads, but needed the 417s for the Edelbrock heads I got as they needed a longer reach.
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