13B Rules Adjustment
#29333 from Nick Leverone · Rule change · TB 21-01 (2021-01 Fastrack)
In STU, remove Spec Line in entirety, Mazda 13B, weight 2300.
In STU, remove Spec Line in entirety, Mazda 13B Bridge Port, weight 2600.
In STU, classify Mazda 13B Street Port as follows:
STU Maximum Displacement (cc's) Minimum Weight Notes
Mazda 13B Street Port N/A 2400 Allow any dual throttle
body/bodies. Chokes must be
located within 4” of the throttle
butterfly. Auto-type 2bbl choke(s)
Show 1 more lines
with any dual-Y manifold.