I guess I am misinformed but I had always heard the dual cat cars were all 350s but my B4C has dual cats and is supposedly a 305. Anyone clarify this for me?

 

Dual cats were available with 305's or 350's. By 91 at least all 350's came with dual cats.

 

Yes, by 91 it became standard on the 350's and the only way to get it on the 305's is to get the manual tranny, the dual cat auto/305 was never available......

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I believe '90-up 350s came standard with dual cats, hence why there is only one HP rating for '90 350s instead of two.

 

Thanks a lot guys!!