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?

[normality78]

Alrite. Yeah, i guess what im asking wasnt clear enaugh. pardon my bad english. Im not talking about GE head and inlet manifold. I just wonder does anyone did take the effort and look into the 2 FE head inlet manifold difference

What im trying to ask is, comparing 4AFE and 7AFE inlet manifold design. The runners dia size, shape and the length. As i can see, the 4AFE runner shape was an oval shape port and 7AFE was 2 mini round port. Based on raw eyes judgement, 4AFE inlet manifold runners seems to be bigger, hence shld it be more flow? Another thing is the intake plenum design of 4AFE more on round shape whereas 7AFE is more square.

yeah, i do know 7AFE and 4AFE inlet manifold cant be interchange but the head does. So its not a big issue to me. I just wanna maximise my inlet manifold flow. Soon im going to bore my TB as well. Initially i do thought of changing into GE head but the distributor doesnt fit and i was being told i need a stand alone ecu for it if im going to do it. so i scrap off the Ge head swapping plan.

hope i did make it clear this time round

i've attached my 4AFE inlet manifold and 7AFE inlet manifold

4AFE


7AFE