"7.J.10 Class VG and VF:
Same as Class G or F, except that the class is limited to motorcycle engines produced prior to 1956.For reasons of historical authenticity, vintage engine modifications are restricted to older technology levels as far as practical. Accordingly, in classes VF, VG, VBF and VBG newer technologies such as EFI, or electronic reactive ignition systems are not in keeping with the spirit of the Vintage classes and are not allowed. Computers are allowed for data collection purposes only.
Engines must utilize OEM crankcase, OEM cylinders on flatheads and two strokes and OEM heads on OHV engines. Above components made after 1955 and exact reproductions may be considered legal in Vintage classes if they offer no competitive advantage. Pre installation approval by the board is required. It is the entrant’s responsibility to provide documentation and samples. A .050 in. overbore is allowed on vintage engines only (including production vintage) and will be discounted when the bore size is measured. Flathead engine displacement will be discounted 33 1/3% in determining engine displacement class limits. For example, a 1500cc measured displacement would run as a 1000cc."
The "Production" class requires a stock bike pretty much. The "Modified" class is what is useful for most of the non-stock bikes. Bikes built by the factory for racing tend to be treated as "Altered". All of these rules differ slightly between AMA, SCTA, ECTA and LTA. I think a good deal of the confusion comes from bikes that have received records by have not been protested despite mods that could be questioned. This is not a complaint. I like seeing everybody out there and there are plenty of classes. Because I run with four or five different organizations it is easier for me to stay stock.
Both Steve and Kenny know that Bonneville is the great eaqualizer. I run faster at road race events on the straight than I ever have at Land Speed Events. It is just not as easy as you would think.
David
