4a inlet manifold vs 7a inlet manifold Options

[normality78]

It may sounds abit silly question but i was wondering, does anyone of you guys here did have a look into the differential of 4A and 7A inlet manifold design? I had some discussion with my fren today whom having 7A with 4A inlet head and inlet manifold, i asked him why not opt 7A inlet manifold which he said 4A inlet runner seems to be bigger hence he do think it flow better. what u guys think?

[Kwanza26]

I already answered your question. NO... there is no performance increase because, believe it or not... intake manifolds are tuned to the head's design and flow capability. Also, yes I have compared all 3 of the different manifolds you've mentioned (4AFE, 7AFE, 4AGE) and no... the 4AGE manifolds are NOT better. No, the 4AFE manifold is not better. Each was designed for their given engine. Also, the 7AFE intake manifold, the one in the picture does not have dual runners. Some 7AFE's did have dual runners (not in the US) but that was designed for TVIS and intake flow was physically limited to affect the torque curve. The dual runner manifold cannot be swapped with a single runner manifold because the intake ports on the head are typically different...

This post has been edited by Kwanza26: Jan 22, 2007 - 2:48 AM