HELLO ! Im replaceing all suspension parts ( bushings, shocks,and springs ) on my 1970 chevelle.it had a small block in it now a big block !the question is :i picked up new moog front springs#5450.and rear springs#cc501. thats what it seems like alot of people are running ! i searched out alot of old posts! the old springs came out of a 1972 chevelle with air . side by side the new bb springs are 2.50in. shorter than the sb springs! i thought that the bb springs would be taller !! any one observe this when replaceing springs ! i hate to put it together only to have the sales person say , ooops! they must of been boxed wrong ! please help !!!

Shorter,,,but is the wire diameter larger? BB/AC springs show a free height of 15" installed 11", 6330's that I'm putting in have a free height of 17" installed 11.25"...I guess its hard to really tell,you have to hope the right springs are in the right box.

I just redid my front end on my '70. I still have not dropped it on its wheels yet but I also noticed that my replacement springs were shorter but stouter than the ones on the car. Granted mine is an original big block car but it appeared that in a prior life the car was set up for drag racing with drag shocks, lighter springs etc. I can tell you that with the lighter springs the car sat pretty darn low in the front. I am sure it will sit and ride better with the new springs. Not a direct comparison to your situation but I hope it helps. Skip

I just swapped-out my Moroso SBC front springs for
some BBC springs. The SBC are taller but not as stout. Also, the BBC springs were easier to install.

Emil DUsek
71 Chevelle SS-502