67 L79 spark plugs - difference between R45s and R45TS

[Ara G.]

Re: 67 L79 spark plugs - difference between R45s and R45TS

20240729_214240.jpg20240729_214240.jpg

A gasket should be used with this type of spark plug, but I recall decades ago reading that not using a gasket would raise the CR a bit for more power. I recall trying it once, but found no SOTP difference, and didn't detect any significant leakage either.

Back in the day I bought a box of 100 AC copper gaskets and used a fresh gasket with each plug change. This was when I was still using the OE AC 44 type and bought a spare set to swap back and forth because they would foul out in a few hundred miles of urban driving causing ignition breakup as low at 4000 RPM. Once I switched to the 45 cleaning was much less frequent, and I found that reusing the gaskets at least once was okay.

I learned about spark plug heat range from an article in Corvette News, and the '63 Corvette Owner's Manual has heat range recommendations for various types of service including racing so I bought a set of AC 43 spark plugs for Kent hot lap days.

Duke

Duke,
Thanks for the reply. The AC 45 set i am looking does not have copper gaskets, it comes with steel gaskets. See pic attached. Assuming these would be fine? I also ordered a set of the Denso plugs. Having both sets is fine with me. As always, appreciate all the insight. ARA

[Duke W.]

Re: 67 L79 spark plugs - difference between R45s and R45TS

Yes, they should be okay to use. Are you sure those gaskets are steel? It looks like they might be aluminum to me. Check them with a magnet.

Duke

[Ara G.]

Re: 67 L79 spark plugs - difference between R45s and R45TS

Fellas, what should i gap the plugs to?

[Leif A.]

Re: 67 L79 spark plugs - difference between R45s and R45TS

Fellas, what should i gap the plugs to?

.035 will get 'er done, Ara.