Is that a mistype??
The "T" in the AC line means that's a small 5/8 taper seat plug. The "U" in NGK line is also the small 5/8 taper seat plug.
I wouldn't think that's a typo twice??
I ask because shouldn't L78's be a square port large gasketed 13/16 plug head?? Or did GM go to the small plug on L78's in 1970??
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