"good" 3400 exhaust manifolds

[ZeeTwentyFour]

When looking on domestic crew they say there is a set of "good" 3400 exhaust manifolds. Their design is similar to 3500 manifolds, semi tubular. Does anyone know which 3400 equipped vehicles have these "good" manifolds?

[Superdave]

almost all 3400's have the better rear manifold, the front one is still the same though.

[19Cutlass94]

Im running the log style manifolds on mine, front and rear, and havent run into an issue yet. Probably sacrificing a little bit of power though.

[johnnymossville]

My 3400 manifolds are like Superdave described and they came off of a '97 Venture van. I ported them and opened the rear manifold up to fit a 2.5" downpipe. My car ran very well with them but with the headers it ran much better.

[ZeeTwentyFour]

so then is it only the rear manifold that is like this?

[IsaacHayes]

Yes. Front is still log.