I didn't look close enough at the Masters rev limit initiative! It is being applied to some of the Gentleman Drivers Grid as well. Quoted below-
7.5.1 The RPM limit on all cars will be restricted as per 7.5.3 unless the engine type used is not listed therein. Only the use of an MSD 6AL ignition control (ref: MSD PN 6425) is permitted to control the RPM. The permitted ignition control must be fitted well out of reach of the competitor/driver.
7.5.2 Any control of the advance curve must only be RPM related. It must be executed solely by means of the distributor. No external control of the advance system is permitted. MSD ignition boxes that control advance or allow advance mapping are not permitted.
7.5.3 REV Limits:
V8-engines – 7000rpm
Twin-cam engines – 8000rpm
Jaguar straight-six engines – 6500rpm
Austin Healey 3000 – 7000rpm
