Titanium Valves in SS

[fredjohnston]

Originally Posted by Alan Roehrich

When they refactored the aluminum head combination to 411 a few years back (that's 16HP over the iron head combination, which is a natural SS/D car), they allowed the aluminum head combination to move to SS/C, from SS/D.

When it was adjusted to 411 in 2013 the factor changed to 7.65 which made it a natural D car as you stated. This car hasn't been able to run SS/B legally since this change but yet continues to do so.. It's a SS/C, SS/D, SS/E only car.