Spark Plug Heat Range - ZR-1 Net Registry Forums

XfireZ51 · 06-16-2008

Pete,

I'm positive its a 41-630. But I will look again when I get home. One other
possibility is that if I do have heads with tapered seats, it would give more evidence that the motor had in fact been replaced as I was told. Supposedly, original motor had cam seize issue and GM replaced it with a new one. Sepaking with Ron Kreigh at BG, he said that the service engines were all 4 bolt, 93+ motors. Curiouser and curiouser.

06-16-2008	#8
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,686	Re: Spark Plug Heat Range Pete, I'm positive its a 41-630. But I will look again when I get home. One other possibility is that if I do have heads with tapered seats, it would give more evidence that the motor had in fact been replaced as I was told. Supposedly, original motor had cam seize issue and GM replaced it with a new one. Sepaking with Ron Kreigh at BG, he said that the service engines were all 4 bolt, 93+ motors. Curiouser and curiouser.

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