Equalized Intake Manifolds?

Discussion in 'Street/strip 400/430/455' started by 73 Stage-1, Nov 11, 2019.

  1. 73 Stage-1

    73 Stage-1 Dave

    I've come across a thread or two mentioning equalized intake manifolds, and some vague support for it, but no hard data for actual gains (airflow, HP/TQ or 1/4 mile), or not worth the ROI (unless maybe part of the FAST series?).

    I seem to remember it being a topic in GSXtra a good while back, and may Greg Gessler may have mentioned it when he did the heads for us a hundred years (or-so) ago.

    I've searched here a few tabs back, but came up empty.

    As with everything else, I am sure the rest of the package has as much to do with it, but have to think it can’t hurt anything (but the wallet). More efficient is more efficient.

    Anything to it? Not worth the effort? Any B4B / Buick porting specialists (It seems Greg is into Q-Jets and not doing port work any longer)?
    Last edited: Nov 11, 2019
  2. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

  3. flynbuick

    flynbuick Guest

    Chevy gained 3% over the LT1 by going to equal intake runners length on the LT2

    PONTIAC, Mich. — Chevrolet lovingly refers to the LT2 in the 2020 Chevy Corvette as the “jewel” of the car. We don’t disagree. It’s a pretty engine, far prettier than any other base Small Blocks we’ve seen in Corvettes past. You can gaze upon the engine from the exterior of the car, too, so long as you haven’t bought the Convertible.

    Chevy brought us to the GM Performance and Manufacturing Center in Pontiac, Michigan, to give us all the nitty gritty details about its “jewel,” and now we can share them with you. There’s a whole lot to discuss, so let’s get right into what Chevy did to make this engine worthy of living in the heart of the first mid-engine Corvette.

    Despite similarities between the LT2 and the LT1, Chevy stresses heavily that “it isn’t the LT1.2. It’s the LT2.” Changing the name of something doesn’t always mean anything, but in this case, the new engine designation makes sense the more you look into it.

    Everything started with the architecture of the car. Now that Chevy doesn’t have to worry about forward visibility over a big V8, it can take some liberties on how much space it’s using in the car. Of course, Chevy didn’t change the 6.2-liter displacement, but other things have changed. The intake manifold grew in height and volume, from 11.1 liters to 14.1 liters. All the intake runners are the same length as well, something that wasn’t geometrically possible with the LT1. This means more power at higher RPMs and general flow improvements Chevy says it’s a 3 percent increase in performance over the old intake manifold.

    This article originally appeared on Autoblog
    Last edited by a moderator: Nov 12, 2019
  4. 73 Stage-1

    73 Stage-1 Dave

    Thank you, Larry - apparently my reading comprehension/attention span on the ipad isn't what it should be, but that post is what got me thinking of this again. I've done back-to-back four-hole and open spacer testing on the B4B, and it likes the open much better. Response is great even with a 850 HO, but think I am leaving something on the table, power and efficiency-wise. It's these kind of details that make things "run better than they should." Just want to learn all I can before heading down the path...

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