Upper and Lower intakes matching?

[RedogOnyx]

Question::

The upper intake ports are a bit smaller than the lower ports, should I get a dremel and make the upper match? I know it's good for the heads to intake, but intake to intake?

Roughly the ports on the lower are 2 and 1/16 inches and the uppers are just shy of 2 inches, but they aren't all the same size. The smallest is just under 2 and the biggest is exactly 2. Now I know using a regular ruler isn't exact enough. If I did this, I'd use one of those bolt measuring thingys.

Just got the Both done in "Black Wrinkle" and the letters are in "Mirror Red"

The black will match the valve cover I put on last year and the red matches the intake tubing.

Enjoy the pics

[RedogOnyx]

Currently my engine looks like this:

The lower mani currently has a small crack in it. My old mech did it when he overtightened the upper to the lower. It only has a small vacuum leak, but the car stumbles a bit more than it used to.

[IsaacHayes]

It may be harder to match them than it was for me. I matched mine but the 3500 plenum is very easy to port as it has no runners and the material there is thin. Yours tapers bigger so you'll need to blend back into it some to keep the same funnel shape.

[SappySE107]

How does the upper line up with the gasket vs how the lower lines up with the gasket? I always err on the side of smaller on the upper vs lower because you don't want to have any big walls in the path of flow. A small amount is fine though and won't effect flow. I guess a visual on the differeces would help me give you a better idea specifically to those 2 manifolds.

[ArtosDracon]

Can you take a picture with the gasket that you have sitting on the upper intake in you pictures on the lower, it looks like the top has been gasket matched pretty well already and the bottom may have been over done slightly, this will create some(extremely minor) turbulence but won't impact flow measurably, were it the other way around it would be worth fixing but, as it is, you should be fine.

[RedogOnyx]

Will get closer pics tonight or tomorrow.

I'm at work right now

[IsaacHayes]

Yeah going smaller to bigger won't hit a lip, but will slow down the velocity some since it negates the funnel effect a little in that area.

On mine I lined up the gasket on how it would be on both the upper and lower and secured it in place before tracing where I would grind out. And I marked each gasket to what side it went in case they were different slightly, which they were.

[RedogOnyx]

Here's pics of the upper and lower ports:

Upper is first, then the lower are the 2 last

[SappySE107]

try using the macro function, those are blurry as hell. I still need a pic with the gasket on there.