Any reason a transbrake valve body would be slower than non tbrake VB

Some of the Super Stock guys claim that their car are faster off the football then the transbrake,
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sometimes in qualifying they will try it. But the AMX doesn't leave good on the footbrake and the AFB carb. I would think it was converter or high gear related, versus the transbrake valve body.

Faster off the football , a fan no doubt !