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Why not try it as is?
If you dont like it you can carve later.
Usually match everything here but 2-4's and in you app, may be fine as is, may add torque.
Also like stacks, made buy who?

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Yeah I was wondering if the narrower runners might add to bottom end torque which I sure would like as much as possible....??????

My engine builder said leave'em alone...

The stacks are K&N's....really nice pieces and run about $70 a piece.

Rickster

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The smaller runners are going to help with velocity and help make extra torque for ya.

I agree with your engine builder's suggestion to leave them alone.

If it were a case of the opposite with a cylinder head port that was smaller than the intake runner, then I would think you'd definitely have to do something. but not in this case. it might actually help ya.

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That's what I thought with the smaller runners

Thanks, that saves me a ton of grinding

I do need to do a small amount of grinding to match-up the plenum top, but very minimal and will smooth out the casting seams and a few little slag here and there and shoot it out to be powder coated

Rickster

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The smaller runners are going to help with velocity and help make extra torque for ya.

I agree with your engine builder's suggestion to leave them alone.

If it were a case of the opposite with a cylinder head port that was smaller than the intake runner, then I would think you'd definitely have to do something. but not in this case. it might actually help ya.

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I gotta say.... why have large port heads, and a tunnel ram if your looking for tourqe???
I would think the mixture coming in would have a ton of turbulence coming out of the manifold and into a big void of a port, with that 90* edge of manifold left.
It wont take long with a good carbide to at least blend it deep into the manifold for a smooth transition. keep in mind, your not going to open it up to and add a bunch of cc volume. I would just go for a smooth transition, as deep as you can reach.
Think of the air going over a box truck in the winter time, with all that snow swirling behind it....doesn't seem good for areo. nice looking setup though
good luck

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Actually the smaller intake port acts as a reversion dam, especially on the bigger overlap cams with tight lobe centers Same thing on the exhaust, you always want a bigger exhaust flange port size and pipe size than the heads port size to help stop reversion on the overlap the box truck example does not have a bigger diameter pipe behind it to funnel the airflow through it Venturi effect proves that fluids funnel down into a smaller size increase speed, reduces pressure within the column so there is no bad results at all by having the smaller size intake runner on top of the head intake port, if within reason on the two sizes