318willrun said

I guess I'll see what some here come up with. I don't think SM is any worse than the Eddies. Not saying it's right, but people have been bolting on OOTB eddies for 25 years ?? Not one issue reported due to plug location to my knowledge

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toolmanmike said

What plugs are you thinking? Here's what SM recommends: "SPARK PLUGS
Our heads require the use of 14mm. x 3/4 reach 5/8 hex gasket seat sparkplugs. Some recommended plugs are; NGK BCPR6ES or R5671A-7, Champion RC12YC, Autolite AR3923 or AR3924. Remember these are for mild street engines. Higher compression or boost requires colder sparkplugs!"

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