Originally Posted by BigDogRacing
A different taper or different depth? I've never seen 2 turbo heads that use different threads or different taper?? But I suppose it's possible. I've run an O'donnell 77t in an OS 12TZ tho...
Different taper. I've never seen a plug with a different thread. But the conical portion of a turbo plug has a different taper to it. Picco,Novarossi,OS,
all use different tapers. I've only used OS plugs in OS engines. I never found a replacement. I have no problem with OS engines; its just hard to find decent priced plugs for those engines in my neck of the woods.
Pass you soon...