Lets talk feeler gauges

[Nortoon_imp]

I am strictly old school and seldom mess with precision machines.
saying that , my spark plug gauge is the typical auto store round one that has graduated gap.
also use an off the shelf blade set from an auto store .

I do need to check the valves on my 1948 GMC that has the optional 270CI . those valves are checked Hot BTW , besides being 6 volt positive ground the old engine holds 11 qts of oil ......... hope no one minds seeing a photo of it as it is motorcycle related considering you like HP this was the last unrestricted BUSA built 12 / 1999 but was a 2000 model , it ate Michelin pilots ......

I was on the back of a friends Norton Commando 150 miles from home when it faultered. He used a small stick to hold the mechanical spark advance open, the cover of a match book to set the points, and a cigarette paper between the points to set the timing. Purred like a kitten the rest of the way home.

As I remember a match book cover could also be used to gauge 2-stroke spark plugs. But it has been a long time, and I don't remember much anymore more.