I am looking to machine my own custom valve covers but have been unable to find reliable models for them... does anyone know where all the aftermarket companies get CAD models to machine for billet LS valve covers?
Is there a way to get OEM CAD models? or something close to likely correct?

I'm new to the forum - sorry if this isn't the best spot for this questions.

 

grabcad has a reasonable model. most aftermarket companies have a licensing agreement with GM to get CAD direct from GM.