| Date | Description | Location |
|---|---|---|
| August, 2022 | Revision of acceptable transmissions and clarification of engine replacements for Replica cars | General Rules: C. Car Eligibility Section J. Replica Cars |
| April, 2022 | Visiting Contingency cars need not have a fuel cell to run in RMVR events IF the car’s logbook issuing organization does not require a fueld cell for that car’s class | General Rules: C. Car Eligibility Section H |
| June, 2021 | Added Replica Car Designation | General Rules: C. Car Eligibility Section 1, Paragraph j |
| June, 2021 | Removed 2 Race Maximum for VMC-Affiliate Members | General Rules: A. General Rules |
| May, 2020 | Head & neck restraint recommendation | General Rules: D. General Safety Equipment Requirements, Section 16 |
| April, 2020 | Creation of new IMSA GTU Class | General Rules: C. Car Eligibility, Section 1, Paragraph f |
| Sep, 2019 | Renewal of Competition License (B.2.b) requirements were updated. | General Rules: B. Driver Eligibility, Section 2, Paragraph b |
| Aug, 2019 | Exhibition Cars definition (C.1.h) was replaced by Contingency Cars definition. | General Rules: C. Car Eligibility, Section 1, Paragraph h |
| July, 2019 | Eye protection rule changes for 2020 season. | General Rules: D. General Safety Equipment Requirements, Section 11 |
| June, 2019 | Exception added to the 1981 CGR(GT-1) to allow cars designated in the 1981 PCS as having 14 inch wheels to use 15 inch diameter wheels | Exceptions to the 1981 CGR (GT-1): Table 1 |
| June, 2019 | Exception added to the 1981 CGR for Production, GT-2, GT-3 and GT-4 to allow cars designated in the 1981 PCS as having 14 inch wheels to use 15 inch diameter wheels | Exceptions to the 1981 CGR (Production, & GT-2 through GT-4): Appendix A, Section 2.2 |
| May, 2019 | Class Formula V-3 eligibility changed from cars manufactured prior to January 1, 1990 to cars manufactured prior to January 1, 2000 | General Rules: C. Car Eligibility, Section 1, Paragraph f |
| May, 2019 | The use of the Pierce aluminum cylinder head is permitted provided the weight of the car still meets the GCR specified minimum. | RMVR Exceptions to 1972 GCR (Formula Fords) |
| April, 2019 | Safety harness manufacture date age limit changed from 5 years old at start of race season, to 5 years old at the start of the calendar year | General Rules: D. General Safety Equipment Requirements, Section 1, Paragraph d |
| August, 2018 | FSV rules changed from being GCR based to that of the 2017 Monoposto Registry rules | General Rules: C. Car Eligibility, Section 2, Paragraph f: Sports Racers and Formula Cars |
| August, 2017 | Changes to approved tires for A, B, C Production and A Sedan classes | Exceptions to the 1972 GCR (A, B & C Production Cars and A Sedans) |
| July 2017 | Changes to criteria for allowing cars to run as “Exhibition” | General Rules: C. Car Eligibility, Section 1, Paragraph h: Selected Exhibition Cars |
| July 2017 | Changes to allowed “guest cars” (cars with VMC log books) | General Rules: C. Car Eligibility, Section 1, Paragraph i: Guest Cars |
| April 2017 | Expansion of approved distributor types and functionality for FF and CF classes | Exceptions to the 1972 GCR (Formula Fords) Exceptions to the 2009 Monoposto Rules (Club Fords) |
| February 2017 | Definition of “continuation cars” for FF and SR classes | General Rules: C. Car Eligibility, Section 1, Paragraph f: Sports Racers and Formula Cars |
