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Stock front coil spring height?

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Does anybody know what the height of the stock coil springs are? I'm trying to figure out if mine are stock or aftermarket. Should they say GM ob them somewhere? 

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Ron,

GM selected and installed one of ten possible front coils and one of 3 possible rear coils in each individual first gen Monte based on the total weight of that vehicle including all options.  It had nothing to do with whether that car had a "small block" or "big block" engine as is commonly thought.  You can find the "Free Height" listed for each possible spring in the table below (shown in the second column from the right).

If you have a Build Sheet for your car, check Box 13 for the front spring Assembly Code that was selected for your particular car.  If you have a reasonably optioned 454 car, the code will likely be GQ which has a free height of 18.13 inches.  While the part number is also shown in that table for each spring, I don't believe it is stamped on the spring (unlike Moog springs which do have a stamped PN). 

You can also use a micrometer or digital caliper to measure the diameter of the coil wire (clean it first) and compare that to the spec given in the table.  The overall free height may change over years of use but the coil wire diameter won't.  Good luck.

 

FGMC Spring Specs.jpg

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I was looking at your list and my tears match (BM) but my fronts don’t (AK). Is that something odd or is that a year specific list. Mine is a 71 SS

BC98FA92-6574-4BD7-B8A3-13C22F43A60B.jpeg

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On 6/29/2020 at 1:19 PM, Dtret said:

I was looking at your list and my tears match (BM) but my fronts don’t (AK). Is that something odd or is that a year specific list. Mine is a 71 SS

 

The table I shared is from the 1970 Monte Carlo Specifications document so it is possible that different/additional spring codes were used in '71 and '72.   Yours is the first build sheet I've seen that has a different code but perhaps there are others.  Maybe someone has the 1971 Monte Carlo Specifications document that shows the table of possible springs/codes used that model year.

If the "AK" code is in the other series of "A" codes, it would be a mid-range spring.  That seems surprising to me unless your SS is a lower optioned vehicle, especially with no A/C which adds more to total vehicle weight than any other option except a big block. 

My big block, 4-speed '70 was a very low option car (not even power steering) and was built with the AO front spring.  A heavily optioned small block car could have a higher total vehicle weight than a low optioned big block car. 

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I would say low options on the interior but it does have ac power windows and locks and got forbid am 8 track. Bench seat and idiot lights 

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