Join Date: Nov 1999
Location: Arroyo Grande/SLO, ca usa
If your car is level, don't change your springs! Many of us are just striving to keep our cars from sagging on the drivers rear side. Be fortunate your car rides level. The front geometry of the subframe and a-arms on a 1st Gen. car is poor, and "bump steer" is a big problem. So, springs aren't the only problem. However, putting in a one inch diameter sway bar cannot hurt.
Here is my conclusion of swapping front springs this summer. If you put in stiffer front coil springs, you will have better handling on your 67 IF and let me repeat the word "if" the front end is signficantly higher than the rear end. Case in point. I put some 370# rate springs in the front that made the front 1" higher than original. My 67 handled tremendously better during cornering. It was like driving a 3rd generation Camaro. Well the increased height made the car look weird, plus I couldn't see diddly out the rear view mirror. So, then I cut one coil off the 370# springs. The height profile look a little lower than my stock springs, but I bottomed out on the rubber A-arm bumpers a lot and I noticed that rear end once again started to rise again during sharp cornering. Okay, back to square one. So, I put in some Hotchkis 600# springs in the front. Boy did the profile appearance improve dramatically My car looked like it was ready for a pictorial in Super Chevy from about 20 feet away where you couldn't see the lousy paint job. The front end was low, sexy and sleek looking. Handling was still better than stock, but to my discerning butt handling was not better than the 500# springs. If anything, it was worse because the rear end returned to the same propensity of rising above the center of gravity during harsh cornering. In other words, if you put high rate lowering springs in the front to get maximum cornering benefit, you are going to have to put high rate lower leaves in the back to keep the rear from passing you on harsh cornering. Oh by the way, once you do both front and back high rate springs get use to the fact your will feel ever defect in the pavement like you are riding on a skateboard. After I put the Hotchkis springs in the front, my lower a-arm sat 1 1/2" away from the subframe mounted triangular rubber bumper. That should tell you how much lower, stiffer, and how many more road imperfections you will feel. And then there are hazards like bone jarring speed bumps and high spots in steep driveways you will be scraping your subframe on.
I'll repeat myself, if your car is level, don't change your springs, just add a thicker sway bar with polyurethane endlinks!
[This message has been edited by bonecrusher67conv (edited 11-27-2001).]