looking at suspsension parts for my 67 coupe. its a daily driver but handling performance is more priority than comfort. 620s are probably over kill, would the mach 1 springs work? they seem heavier duty than stock but less than the critically acclaimed 620s.

i plan on a >than one inch sway bar. and lowering the car 1 inch in the front and stock hieght in the back. looking into CAs not sure what to plan for.

i didnt want to hijack posts.

the car also is getting 17s with 245/45/17, and four wheel discs.

 

I just went through this myself. I decided to go with the Mach I coils. I found out the following for my 70FB:

Stock Spring rate: 289 lb/in
Mach I spring rate 428 lb/in

I think the 620 would be too stiff for me from everything I'v heard, but I had a 70FB years ago that had stock coils and it was too soft. I think the Mach I coils will be just about right for me. You could also go with some of the aftermarket coils out there in the 500 lb/in range, but I just decided to go with the Mach I springs. Got them last week, but since my car is probably a year from hitting the road, it will be a while before I can actually say if it was a good decision.

 

You shouldn't need a sway bar bigger than 1" in the front. Any more and you'll need a rear sway bar to counter it, and by then your suspension is so stiff it doesn't want to travel. Stick with 15/16" or 1".

Do the Shelby drop. Period. Cost is almost nothing (drill bit and template materials) and it will drastically improve your suspension geometry for better handling and less body roll.

An export brace should be considered mandatory. A monte carlo bar would be a good idea as well. Both will tie the front end of the car together to keep it from flexing in the corners.

 

thanks for the info. i guess ill go with the smaller sway bar.

the idea is to create something that can handle its own. i was planning on a rear swaybar and eventually 4 link conversion. but thats way down the road.