The SB Chevy where the first to need and use a stud girdle due to the severe flexing of the individual studs walking around with race springs and high RPM, not good down work
The paired shaft or individual shaft rockers used today are way better for racing, especially high RPM, with high (above 700 Lbs.) spring pressures opened use today up scope

Last edited by Cab_Burge; 12/09/17 05:17 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)