'68 Slant 225 Plug Tube Washers?

doc540 said

Dan, is it just my imagination or is my SS running better with the long NGK's at .45 instead of the short Champions (with washers) at .35?

Sure seems to be a difference, but maybe I'm just fooling myself.

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Maybe not? I was running Spitfires for a while and it ran good, till I discovered that one of the plugs had cracked. Replaced them with the NGK's gapped at .50" and I'm truly amazed at how well it runs. It's just boggles the mind at what a change in spark plugs can do.