[Jim B]

Back in the day Ed Hamburger's team cars had the torsion bar diameter ground down in increments and track tested to fine tune the spring rate. I remember a very generous radius in the hex to bar diameter area when lower class cars were involved. I wouldn't think a 383 combo with todays rear suspension technology would be in this category. I'd be pretty sure with 4 wheel scale numbers and feedback from this forum you could get a stock bar that's pretty close to what you need. Don't forget there's left and right....Reversing the side can end up with a bar snapping at unopportune times. The 3 digit number at the end of the bar is even for right and odd for left. (ie, 774 is right and 775 is left.....780 is right and 781 is left, etc.) The bars are thicker as the paired number increases.