Scott, I did find the number in my GM Restoration Kit but only amid a listing of 20 or so *Rear Spring Specifications* with no particular model, suspension, or anything identified. The specs on the springs are: Assembly code: BM Cut-Off Length: 92.6 Wire Diameter: .539 Total Coils: 5.65 Deflection Rate (lbs. per inch): 130 Height (free): 13.08 Working (IN. @ lbs): 9.00 @ 530
These are prefaced by, "Selected from a family of springs by Electronic Data Processing which identifies the correct spring for the weight of the vehicle including optional equipment ordered by the customer." There's probably 30 or more front springs listed the same way. I checked the build sheets I have for 69s and don't show a F41 option on any of them - even COPOs. I do see BM coded in box 14 in quite a few of the examples I have (all SS396 optioned cars). I only see one with RPO F40 suspension called out though. I have some for L78 cars, one (Kansas City) with BL rear springs, one each (Fremont & Baltimore) with BM rear springs and one Baltimore L78 that I can't make out the code. The BL specs differ from the BM in two areas only ~ Height (free) is 12.77 and Working (In @ lbs) of 9.00 @ 490. Interesting: 3 Baltimore, 2 Kansas City, and 1 Fremont car also lists RPO *F62 Front Springs and RPO *G62 Rear Springs where my single Framingham sheet does not list these. All three 396 engines are among those 6 cars as well; L34, L35, and L78. Note the asterisk (*) in front of the springs RPO code. This indicates "Standard" which means they were installed on the assembly line and not referred to the body shop or trim shop for special attention. Check out the build sheets I have at http://www.chevellestuff.com/69velle/69_build.htm and maybe you can find some help. (?) Dale McIntosh TC Gold #92/ACES #1709/NECOA #41 DalesPlace My 67 El Camino ChevelleStuff Decoding info on 64-72 Chevelles MidwestChevelles Midwest Chevelle Show Information
