The Best Carb Spacer for a Dual Plane Intake!? Easy Power (L31 Budget Build)

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Dyno Testing Carb Spacers on the Budget L31 Build (LT4 Hotcam) Open Spacer, 4 hole Spacer and Tapered Combo! Plus a bonus 0w20 Synthetic test!

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L31 Dyno video
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I just happen to catch this video. My 70 chevelle LS5 had a 2” open spacer I switched it over to the speedmaster tapered combo installed upside down as you suggested. With out a doubt it improved the throttle response off the line. Thank you for the awesome tip it really worked for me.

anatollavi
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I tried the 1" Hamburger tapered combo upside down on a Performer RPM Q-Jet manifold and 850 cfm Q-Jet. It worked well.

chrisreynolds
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Cool to see a face with the channel . I remember watching few years back and it was different. One of my favorite channels thanks pat .

jeremyedwards
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Pressure being resistance to flow = increased load on cam gear / distibutor gear too. I'd be putting eyeballs on it too, it's nice that it's on a stand, and easy to do. I remember lifting a 302 out of a fox to investigate oiling issues, -good times- !

jamesgeorge
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This really excites me because in one of the engine building FB groups I’m in everyone seems to think that the vortec heads that I picked up are worthless because they’d been upsized to 2.02/1.60s. Most people think that kills the way they flow. Definitely looking forward to seeing your next video on this with more information on the parts you used.

clayeden
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By flipping the spacer you introduce a shear edge to the flow path. That will help atomization. You might be able to reduce timing and still light up combustion and gain power.

jamesandannschmitt
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I recently built a vortec combo almost similar to yours cutter. It's std bore with stock pistons with the deck milled .020" and 062 heads flat milled .040". I fully ported the heads as well with the stock valves 1.94/1.50 in them. Stock crank and rods with a mellings hv 55 pump. The camshaft is an old hydraulic flat tappet by Crane 286H06 grind. It has a Chinese airgap intake on it along with stock rocker arms and 5/16 chromoly pushrods. We are running a turbo 350 tranny with a 3500 stall and 4.56 rear gears. Car build is steady moving along..

coreybutler
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Yelp ill order on for my 383 I want all the power I can get, just a old motor head love your dyno testing, I wanted more hydraulic roller cam for my 4wd but 7200 lbs I was limited I'm gonna get me w 3000 lbs car to play with 😊😊, keep em coming, build a 383!!!

RonaldLewis-pyyt
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Pretty sure the 4 hole tapered spacers are designed for single plane intakes. Very cool that it added power flipped upside down. HVH has a dual plane spacer called the Street Sweeper. It’s basically an open spacer with a radiused bridge to smooth the transition at the plenum divider.

evanarthur
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While you have the oil pan off, install an inexpensive 5qt Spectre pan for a 1-ton truck or van and a longer milodon windage tray (requires 2 additional studs & nuts). Then run the normal 4 qt oil capacity in the pan. It will pick up power. I run Enos 0w50 and my engines have loved it.

chrisreynolds
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Nice power from a budget build. Thank you

twopopsaqullu
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Nice work, really enjoy your videos. The audio has quite a bit of room reverb, can you place the mic closer or get a wireless lapel mic?

PeteBasel
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That's what I am running. 2" flipped combo (done by accident) on a weiand speed warrior air gap cut dual plane intake and a 600cfm edelbrock carb.

Dirtnap_Dan
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My favorite spacer is a NOS cheater plate, it gave me 250 hp lol you should try that on this engine.

turboboy-oqxe
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Vizard claimed some good gains from radiusing the notch in the intake. I'm not sure if he added the notch. I noticed the performer rpm on my brothers 350 has no notch. My air gap rpm has it. I've heard great things about those "super sucker" spacers, that upside down trick is very interesting! Really enjoying your channel bud! I've got the hotrod bug again, been over a decade since I've had a project.

jefferycoleman
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As always good info for the oldschool guys en girls. Love it!! Great knowlidge from top to bottom. I have only one question. Wat is your opinion on the GM 12677151 camshaft? This is hart of the sp350/357 gm crate engine. the “latest” engine from gm with vortec heads.

SuperrRonnie
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Good information as always! Waiting for the next one.

lsnovassr
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Good information, testing is the only way to know. AG

goldsgarage
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Today, my 359 sbc was on the dyno. Has 9.3 to 1 cr. Using a Perfomer RPM intake and an 850 Proform carb with the flipped 1" HVH four hole tapered spacer. The engine made 470HP and 475 lb ft torque. All in by 6200 rpm. The spacer, upside down, gave me 7hp, and torque down low was good. Your suggestion works! With a 750 Proform carb, lost 5hp and 5 lb ft torque.

staninoshawa
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Love your videos man been trying to save to get a vortec motor for my 92 Camaro

samsunofthesun