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1949/50 Oldsmobiles Sparkplug Chart


BillV
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BillV

Does anyone have a sparkplug chart for 1949/50 Oldsmobiles? I have AC Delco R45S in mine

and "assume" they are correct.

AC R45S = Resistor by14mm by # 5 heat range by extended core nose.

AC R45 = Resistor by 14mm by # 5 heat range.

AC 46-5 = 14mm by # 6 heat range by .050" gap

AC 46 is the old 14mm by # 6 heat range no resistor or extended core nose.

AC 45 is the old 14mm by # 5 heat range no resistor or extended core nose.

# 6 heat range is just one heat range hotter than a # 5.

"R" = Resistor

?S? = Extended core nose sparkplug.

If you have a radio you will likely need a resistor if you don't have resistor wiring.

If you are really interested in the AC sparkplug chart go to this address:

http://www.acdelco.com/parts/sparkplugs/identification.jsp

M.L. Anderson

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  • 14 years later...

1950 Oldsmobile 88 service manual (p. 16-25), it states -

45 AC spark plugs are used on 6-cylinder engines (does not apply)

46-5 AC spark plugs are used on Rocket Engines (8 cylinder)

Plugs are metric 14mm, 13/16 hex body
Proper gap setting 0.30" for eight cylinder model
Replaced at intervals of 10,000 miles

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