Rule Interpretation

August, 2003

The VSRG Vintage 2.5 Challenge rules are pretty simple which does not mean they are “loose” nor or they designed so that a driver can “design” their own interpretation.  This is especially true of the motor rules where the bore and stroke are defined based upon stock.  The rules allow for a maximum bore size over stock of .080.  Additionally the stroke of the motor must remain stock as indicated in the SCCA Recognition Form for the car. While the rules allow the crankshaft to be replaced with one of similar material there is no provision for changing the stroke or utilizing a crankshaft that has different dimensions from that which came in the block originally.

1. Just because the rules do not specifically state “no stroker motors” does not mean that stroker motors are ok. 
2. We suggest that you always read the rules with rule 3A in mind as well as 6.A.1 which states: “It is not permitted to make any changes, alterations or modifications to the standard automobile, its coachwork and chassis or any component as produced by the manufacturer, unless such modifications are required under above or specifically authorized by these rules.
3. Our rules follow pretty much all auto racing rules, if it does not say it’s legal, it’s not