AC Delco R43 Spark Plugs - The Supercar Registry

10-12-2008, 11:23 PM

Salvatore Salvatore is offline

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Re: AC Delco R43 Spark Plugs

[ QUOTE ]
I have always used the Autolites,

what I'm trying to find out is do the R43 plugs have a specific application or is it a preference thing.

Thanks guys.

[/ QUOTE ]They are a colder plug used in the 69Z's and the L78 motors. I don't know of any other application they are used for. Maybe some earlier solid lifter motor corvettes.

I don't know if the 1970 High Perf. motors used them or not. Maybe a Yenko Deuce guy will chime in. I would say more of a racing plug.

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