Factory installed spark plugs 1968 BB cast iron heads.

[daveg]

Everything I have points to AC 43N plugs.
Question is what version.
Some examples of different types.
Read some info on copper to aluminum gaskets happening in 1967?

Bought 30 of the 46N's for thirty bucks so they are usem up mules.
Ran them in past in everyday drivers where cutting edge performance was not an issue.
They ran many miles.

There are more versions but these are already bought and I await info here before buying more.

Thanks
Dave

Pic 1 is a "FIRE RING" example with copper gasket and 4 equal green rings.
Pic 2 is a "FIRE RING" example [46N] with aluminum gasket and wide top green ring.
Pic 3 is a "FIRE RING" set with copper gaskets and 4 equal green rings.