I know they have different part numbers, but what is the difference? A quick visual inspection reveals that the 93 NA mani'* have less heat shielding on the front. That won't matter to me. I plan on having them ported and coated. Does anyone know any specifics that would make them a bad choice to get ported and coated for my 92 L67?

bump

I can only tell you that I needed a front manifold for my 95 SSEi and my local yard said they are interchangeable SC and NA, most of the years also.

this may be true but 92-93 were odd years with alot of changes for the 3.8 in Bonnevilles