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Originally Posted by tblake
Bob am I causing damage running AP605's instead of Copper Core 605's? Wally world didnt have 605's, but did have ap 605's which is why I went with them. Should I change them out?
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Hard to say Tim. What gap are you running?
I'm still trying to figure out how good sound discussions here and at other GP forums about which Autolite spark plugs to use as an alternative got side tracked or convoluted and the AP/APP platinums wound up in the picture.
All I can say is I have never used the Autolite AP or APP platinums in my GTP. I went with the AL copper core as originally suggested way back when. They are still available depending on the supplier and obviously Wally World is not the place to get them anymore.