2oldsguy

I have a 70 442 convertible w/o A/C. It has a 455 with the factory aluminum intake, stock exhaust manifolds and I just installed aluminum heads.
The car always sat too high even with the cast heads so I would like to lower the front.
The factory measurement should be 9 5/8" but my car measures 11 1/8" and the back is 11 3/8"
I would like to lower it at least an 1" front and back. The front coil springs have a tag that says "5400", so I assume that is the Moog number.
They are for 455 with A/C.
Any idea what number front spring I should use?
Thanks,
Joe



With 15" tires:

Fun71

Wow, that's sitting high compared to the factory setup.
Here's some info on front springs from a Moog suspension catalog that I archived many years ago that may help you:

> 5390 small block - no AC
> wire diameter = 0.650"
> load height = 11.000"
> load = 1952 pounds
> rate per inch = 336 pounds
> free height = 16.808"
>
> 5382 big block - no AC, small block - AC
> wire diameter = 0.660"
> load height = 11.000"
> load = 2066 pounds
> rate per inch = 360 pounds
> free height = 16.724"
>
> 5400 big block - AC
> wire diameter = 0.660"
> load height = 11.000"
> load = 2167 pounds
> rate per inch = 360 pounds
> free height = 17.004"
>
> 5536 442 small block - AC - heavy duty, 442 big block - no AC - heavy duty
> wire diameter = 0.690"
> load height = 11.000"
> load = 1984 pounds
> rate per inch = 488 pounds
> free height = 15.063"
>
> 5450 small block - AC - heavy duty, big block - no AC - heavy duty, -442 big block - AC - heavy duty
> wire diameter = 0.690"
> load height = 12.000"
> load = 1642 pounds
> rate per inch = 454 pounds
> free height = 15.616"

I have the 5536 front springs in my car (small block with AC) and this is how it sits:

https://classicoldsmobile.com/forums...ost-yours.html

2oldsguy

Thanks for the information.
I love the stance on yours.
Joe