When to change? When they break. /6 are not that light, it's real close to a 318. I've never heard of a TB twisting that far from normal use. TB are made different than valve or coil springs, almost like a drag axel. Check the sockets in the crossmember for rot or cracks. Use the 68-69 383 bar for a replacement.

Last edited by cudaman1969; 08/11/18 11:26 PM.