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The other Sox & Martin 'BO29' in 1968. This one was the 'legal' SS/B Barracuda. With the Super/Stock Springs set up 'my way'.

In 1965, While the other 1965 Race Hemi B-Body cars were 'lifting-at-the-line' before launching. 'The Black Arrow' was gone...... It barely lifted, as it left the line like a 'pre-loaded slingshot', and on 7" Slicks.

The example, Was from 'The Black Arrow' in 1965. Explaining that 'lift' at the line cost you 'launch time'. 'The Black Arrow' never lifted, it just launched forward, like it was 'pre-loaded'.

Yes, Pre-Load is probably not the right term to use.

Do you mean, That these guys had it wrong in April 1968, during their BO29 Drag Race Tests.

So what you're saying is,

Generally speaking, A 30* Angle {bottom eye of rear shackle} should be positioned behind the the upper shackle eye.

My Cousin Vinny, "Are you sure."

Rusty, Some guys have already lived it.

June 1965 'Black Arrow' {1965 Plymouth Belvedere 'Race Hemi'} S/SA One of the 'best' launching cars ever. Suspension set up by Tony Pizzi and Bill 'Grumpy' Jenkins. * Spacer-shims between the front leaf spring hangers and frame. * Unequal length rear shackles. * 'Drag Shocks' This was done...

A-Body-Bomber, A better example. Jack Werst's 1965 Plymouth Super/Stock Back-in-the-Day, I had a chance to 'peak' under the car, and see the 'shim-plates'. Jack Werst, said 'Pre-Load' makes the car launch forward quicker. Instead of 'lifting' all the way up first, and then launching.

Remember, Only 7" Slicks back then, and the compound material of the slick was far from soft.

A-Body-Bomber, Tech Tips as early as December 1964 {Super Stock & Drag Illustrated} Lift or Squat for Mopar Leaf Springs in Super/Stock and A/FX

Early Days We would install 5/8" thick 'hardened' washers as shims, between the front hanger and frame hanger-mount. Created a 'slight' pre-load in the Leaf Spring.

Rear Shocks * 1968 Chrysler 'Imperial' shocks {p/n #3400620} Benefits * Travel {extended} * Jounce {upward compression} * Rebound {downward travel} Old School

I'll try to post the article from Super Stock & Drag Illustrated, Bill 'Grumpy' Jenkins, when he was running the 65' Plymouth Race Hemi 'Black Arrow' had a great article on Rear Suspension with the Mopar Leaf-Springs. Distance, Height and Shim-spacing. He revealed every little trick he...