I know alot are having special ground cams opening up lobe seperation with alot of lift, some are well over 700 lift pulling vacuum. Every racer is always trying to skirt around the rules some has had vacuum pumps hid under the dash with a line running through the heater hose and coming out under the intake, the tech guy one night pulled the coil wire off while checking vac and when the engine died it was still pulling vac BUSTED so the next race I'm going to take a better look at there set up there might be something to this.