The Syclone was slightly faster than the Typhoon due to it's lower weight.
The Silverado SS was from the 2000's and was essentially a pick up Tralblazer SS. The one I believ you're referring to never originally carried the Silverado badge, instead just being called the 454 SS. It weighed more than the Sy/Ty twins, produced less HP (230 vs 280 for the Sy/Ty) and produced more torque, but not by a substantial margin (.385 ft-lbs for the 454 SS, 360 ft-lbs for the Sy/Ty twins). This combined with the fact that the 454SS was cheaper than the Sy/Ty twins, I'd wager they were faster as well.