I can't access the archives to get an answer on what is the original AC plug type, part number, description, number of rings, thin thick etc for a 365 hp 1964?
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Dino Lanno -
Re: Archives
Dino,
With an entirely new server that John connected to last night, the archives have to be entirely rebuilt and haven't been moved yet. He'll be working on it in the next couple of days. Hope to have everything moved to this server by the end of the weekend. He's doing a great job and his plate is full at this time. Until then everyone should please be patient.
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Re: Archives
No problem, I think Mr. Wagoneer is doing a great service for the organization, I appreciate his efforts. The reason I put that reference to the archives in my message was in an effort not to offend people about asking a simple question that had been answered 10 times! But as everyone knows, you can't..............
I still hope someone answers the question...please?Dino LannoComment
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Re: Spark Plugs
Dino-----
I believe the original plugs for the engine of interest to you were AC-44, GM #1559492. This plug may be discontinued, but there are lots still around. Bear in mind, though, that non-engineering(or even some minor engineering) specifications of the part may have changed over the many years of production. So, look around a swap meets for plugs of this type in the oldest boxes you can find. The month and year of printing(which approximates the date of manufacture of the plugs) can usually be found inside one of the box end flaps.In Appreciation of John HinckleyComment
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Re: Spark Plugs
Joe is probably correct. The OEM plug for my '63 340, and all other '63 engines is the AC 44. The owners manual lists alternate choices as follows
AC 45 or AC 46 - City Driving Only
AC 44 (Orig. Equip.) - Town and Country Driving
AC C43 COM - Heavy duty and high output
AC C42-1 COM Extended and extreme high output
Over the years I found that the AC 45 worked best for normal street driving - it had less deposit buildup, but didn't run too hot. I used the AC 43 with good results for race track hot lapping at Kent (Washington). The "4" on an AC plug means it's a 14 mm thread. The heat range is the second digit, and a higher number is a hotter plug.
DukeComment
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