Reply to "Spark Plugs and gaps"

I assume youre not mislabeling the factory 351 cleveland as a windsor.The windsor series of motors has two possible plug types depending on the year the small 5/8 socket later heads(autolite # 25) and the early 13/16 socket(autolite # 45) types.gaps depend on your ignition setup 32 to 45.I use Autolite plugs # 25 in my cleveland and i run a gap of 40.Im running a mild 351 with an MSD dist. and box.Hope this gives you a starting point.