[tommyduncan]

Someone on the other site suggested I look at the spark plug section on Jolly's site. I was already looking on his site but didn't know they had a spark plug section . This topic wasn't addressed but while looking at his engine page #2 I did find this:

"LONG-REACH SPARK PLUGS New, long-reach spark plugs have greater surface area
in contact with cooling passages. These cooler running plugs stay cleaner so they last longer."


This led me to believe they always had long plugs. Then I found this in the same article:

"SIMPLIFIED CARBURETION Highly efficient two-barrel carburetor rations regular-grade
gasoline to the engine. Simple design means easy servicing -- & it's seldom required."

Wasn't the 2 barrel introduced in 62'?
Maybe they changed the plug specs at the same time?

That same article also has a pic of a Magnum style engine so who knows?