Originally Posted by
Brandon Melton
Kalgard- they are different if you look at them. The taper as well as the gap distance to the body of the plug.
Exactly!
I felt the 97t was too cold of a heat range for a vspec. I can see how the 77t would work as it is a hotter plug. I really like od plugs, they are all that I run in my standard plug motors but in my os engines that require a turbo plu, P3's for sure.