Join Date: Nov 1999
Location: Central California, USA
Re: Heidts a arms and hotchkis springs
Suspension springs are designated by coil ID. Heavier rate springs are usually made from thicker wire diameter, so the coils get larger on the OD as a result. Cross breeding suspension parts is bound to have some problems like this.
You may be able to use other coils like Hyperco, they are made from smaller dia wire but better material. The problem there is, they are 9.5" tall and require a threaded "hidden" adjuster that sits on top of the coil. It must be adapted to fit in the upper spring pocket, it's not a drop-in.
Otherwise I suggest you return your arms and either use stock arms or Global West, DSE, or Speed Tech lower arms. Hotchkis will have tubular arms sometime this year too.
Check my web page for First Gen Camaro suspension info:
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67 RS 327 original owner. 1965 Lola T-70