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

[@anatollavi6730]

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.

[@cuttersperformance]

Yeah its pretty wild how noticeable it is on some combinations

[@JeremyFrazelle-or1mt]

What height spacer did you use and intake manifold?

[@anatollavi6730]

@@JeremyFrazelle-or1mt Spacer Hight 2” Manifold edelbrock performer 7561 Carb edelbrock 750cfm model 1411

[@chrisreynolds6520]

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

[@johnpye7177]

I'm doing the same, too much carb? Overkill is underrated.

[@alexbrown4820]

Hey was that on a sbc? Cause I didn't know they made a performer RPM Q jet manifold. It's the manifold I would like, without using an adapter for a Q jet

[@chrisreynolds6520]

@@alexbrown4820 Yes it was. They make them in both for the pre 86 head bolt pattern and the L31 head bolt pattern. The L31 manifold is only available as a $$$ brass water passageway lined marine manifold though.

[@RonaldLewis-py6yt]

I gotta a Q-2 jet I think I need a 750 Dp ,I'll try my Qjet before I buy on my 383 😊😊😊

[@JeremyFrazelle-or1mt]

I’m wondering if the 4 hole acts as an anti reversion plate when flipped upside down…

[@jeremyedwards4832]

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 .

[@mikkokuorttinen3113]

Thank you Pat for the video!

[@jamesgeorge4874]

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- !

[@clayeden1204]

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.

[@cuttersperformance]

The work with porting. If they aren't ported to the valve they can have a negative affect. The exhauat side really benifits from the larger valve. Check out my latest video 480+ hp from a 355 with ported vortecs 2.02/1.6

[@RonaldLewis-py6yt]

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!!!

[@jamesandannschmitt6835]

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.

[@coreybutler4002]

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..

[@twopopsaqullu9721]

Nice power from a budget build. Thank you

[@evanarthur7535]

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.

[@cuttersperformance]

Yeah they are designed for single planes. I will try a flipped combo on the next single plane I dyno

[@joeforster2255]

they are designed to fit any manifold with a standard 4 bbl carb flange.

[@autonomous_collective]

Correct, he used wrong spacers.

[@andrewbecker3700]

Just goes to show that depending on the exact combo your running. The upside-down cnc tapered 4 hole must be creating shear edges that act like a big booster. The pressure is highest right at the shear edge, causing an atomizing effect that will suspend more fuel in the charge. Free power. Works pretty slick if you think about it. Peace.

[@chrisreynolds6520]

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.

[@Thumper68]

There’s no damm way I ever put 0w50 in a sbc. 20w50 only for me.

[@chrisreynolds6520]

@@Thumper68 Why not? Works better than 20w50 and much better than the OE specified 5w30. I ran 0w40 Mobil One in a Goodwrench crate L31 for 10 years, in fact I did the break-in on it and it was near spotless with no real wear on anything. I break engines in on synthetic oil. Why spend time adjusting clearences to be precise then allow added wear to happen on the first startup using conventional oil, makes no sense to me. All Corvettes from the LT1 on were factory filled with synthetic to start.

[@chrisreynolds6520]

@@Thumper68 You realize the only difference in 0w50 and 20w50 is when the oil is extremely cold. The 20w50 is like molases and the 0w50 flows much better on initial cold startup.

[@Thumper68]

@@chrisreynolds6520 no it’s not 😂 when they both are full temperature you will have more oil pressure with 20w50 you will also make more power. Look up engine masters episode they test this.

[@Thumper68]

@@chrisreynolds6520 because my father taught me and his experience and knowledge is far beyond 99% of people. He’s a master machinist and mechanic since the early 70s and building 700+hp sbc since 80s

[@staninoshawa]

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.

[@cuttersperformance]

Best spacer for a dual plane! Glad to hear

[@samsunofthesun]

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

[@turboboy-oq6xe]

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

[@cuttersperformance]

That definitely is the best spacer!

[@ls2novassr23]

Good information as always! Waiting for the next one.

[@Dirtnap_Dan]

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.

[@jefferycoleman3781]

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.

[@RAMIREZTX]

Thanks for the uploads ! 😎

[@PeteBasel]

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?

[@cuttersperformance]

Yeah, im looking into that! Sorry for the poor audio. I appreciate you checking out my videos

[@goldsgarage8236]

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

[@cuttersperformance]

Thank you! You guys are in Ontario aswell?

[@skymit5519]

You need to do 1 more test! 2x 1" super suckers at the same time. 1 upside down on the manifold and the other the normal way on the carb. I want you to try that so bad haha

[@cuttersperformance]

I know, I should have tried that. I will try it on a upcoming dyno session

[@flyinhighaerial3193]

I want to see a L48 350 rebuild/ dyno session.

[@95Sn95]

I know the transdapt 2" Qjet spacer/adapter looks like it flows soooo much better than the almost always used 3/4" & 1" adapters, it has a nice gradual transition looking down it it looks more like just a spacer than an adapter vs the others have a very abrupt transition, maybe there's no difference in flow but it sure looks as if there would be. The shorties look like they would cause a ton of turbulence?

[@jerrymendoza4384]

Nice...great Vid. Wonder how this would act with a performance air gap manifold since it has a raised based / plenum.

[@cuttersperformance]

Every engine reacts differently, but the results would be similar on an air gap and a similar combo

[@SuperrRonnie]

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]

It is the litle brother of the LT4 hotcam.

[@cuttersperformance]

Personally I wouldn't go smaller than the LT4 hotcam, unless your doing a daily driven truck or something like that

[@mekial2222]

I wonder what would happen if you installed two tapered spacers. facing towards each other, away from each other, and same direction both ways...

[@cuttersperformance]

I will try that

[@apw30534]

The oil pressure issue is because you blocked off the filter bypass and probably had a restrictive filter to push through. Ive heard of oil filters bursting due to this. I would try a better filter arrangement or go back to using the OEM filter bypass.

[@cuttersperformance]

The oil pressure is taken after the filter, so a restricted filter would have caused a low oil pressure. The issue was actually just the pressure regulator in the pump itself

[@zAvAvAz]

. . This is so awesome. What if you have two tapered 2" spacers on a performer EPS intake. 355 c.i. 10.5:1, XR288HR on 108 LSA and 106* ICL. Promaxx Project X 215 improved heads. 4 and 7 swap. and best size headers to vacuum tube into empty big muffler to pipe then flowmaster 50's . Notched cylinder edge for unshrouding big intake valve. 4.060" gasket and total quench of 0.038". -4cc reverse dome for easy target compression really short O.150" dome with softened edges of dome. This is what i am trying to build, although going to use a VIC JR for real. Although have an EPS laying around right now. And try some spacer stuff on VIC JR with this combo. Also a stroker of this same combo would be cool for comparison, as the compression and cam are the same. PRW 1.65 roller rockers and the stronger version of beehive springs of what is needed.

[@adammic16]

Well after watching this video i just had to experiment. I have a half inch 4 holed tapered cnc spacer. Never once did i think to flip it as even the brand name is engraved so i dont install it "wrong". The difference was very noticeable at mid range and even leaned up my part throttle steady cruise...i was thinking i may have IFRs too large etc. Im really thinking flipping it is vaporized or atomized the fuel much better. SBC sounds more crisp. Flipping the spacer on my RPM Air gap..750DP..cammed 500hp sbc has certainly worked well.

[@cuttersperformance]

Awesome, I'm glad to hear guys are trying it. Maybe the spacer companies need to put "single plane side" and "dual plane side" on these spacers? Haha

[@adammic16]

@@cuttersperformance my idle went from high 12s low 13s AFR to 16s AFR...i was 1 1/4 turn from seated now its 1 1/2 turns out and back to high 12s...with a standard air cleaner element... It certainly did something flipping it.

[@jauquearnoldi1059]

What was the jetting combo you used? I have the same setup but with a 218/218 Duration Comp cam? I am sure this would make a difference however. Need to get an A/F gauge on it.

[@cuttersperformance]

The stock holley 750 jetting was just about perfect without any spacers. When using a open spacer or the tapered combo flipped, we had to go up one size on the primary and two sizes up the secondary main jets

[@RonaldLewis-py6yt]

I had a Ole Performer and cut down the pendulum now i seei should have bought the air gap but my cam is 5500 range i guess ill try it before I purchase???

[@ctusser]

Good info!

[@joseortega1114]

I'm using a air raid carburetor 1 inch spacer on my 385 stroker

[@mikekurtz8728]

I really want to see what an upside down tapered spacer would do on a 4 hole dual plane intake

[@westoze1134]

Could you try two 1 inch Tapered spacers with one of them flip and the other normal ?

[@cuttersperformance]

Yeah, I want to try that on the next dual plane on the dyno

[@msh6865]

So, the added volume of the spacer causes the dual plane to essentially react like a half step below a single plane. A compromise between the two intake types. Interesting.

[@cuttersperformance]

Thats the interesting parts about the flipped combo spacer compared to the open spacer. The flipped combo doesnt have the drop in low end power compared to an open spacer, so its not just an increase in plenum volume. There's no trade-off, which is good

[@leedarche242]

​@@cuttersperformance I'm thinking it's working better than the plain open spacer because of the smooth transition to the split plenum. It would be interesting back to back test flipping the combo spacer on a dual plane with the divider cut down. Another an interesting test try cutting between the primary and secondary on a 4 hole... keeping it dual plane but adding more volume...

[@eeatem]

I would have to think it is the anti-reversion properties helping the low end torque... the fact it adds plenum volume and some height helps top end. Best of both worlds 😁

[@bigal878]

Great testing 👍🇦🇺

[@scotthultin7769]

Getting electric water pump Run the alternator lower on the motor and just use a belt off the crankshaft to run it and you'll gain 5 to 12 horsepower From the use of electric water

[@billymitchell7743]

Do you have the spring shims to use on the OEM vortec springs? use .030 keepers you recommended. Thx

[@cuttersperformance]

You cant use the stock springs, they cant take much lift or have enough spring pressure

[@Amack1964]

Hey Pat do the tappered spacers work on an airgap manifold as it has the recessed plenum divider ?

[@cuttersperformance]

You'll have very similar results with a similar combo and an air gap

[@Amack1964]

@@cuttersperformance thanks Pat appreciate all the advice you have been providing me here in Australia

[@DeliriumElectric]

Hmm, looks like I've missed 14 months of your videos!! Got some catching up to do

[@thehoule70]

Will that 1” spacer upside down work on a Edelbrock street tunnel ram or is there no use 268x cam two Edelbrock 600cfm 1405s 355 4 speed car

[@cuttersperformance]

Never tried but I'm sure it would be the same results. I'll have to try it one day

[@douglasvance2938]

Hey brother, I’m not seeing anything from you lately, are you not making any videos or am I just missing them?

[@cuttersperformance]

No recent vidoes. Ive neen doing a big shop reno at my home shop. Once im back up and running I will putting out some fresh content. Lots of cool builds coming up

[@spunkyspice4733]

Wouldn’t it basically turn the dual plane solid split into something close to a cut split dual plane?

[@malcolmburton9481]

The part number for the Valve lock is it right as went o web site can't find the Thanks

[@cuttersperformance]

What locks are you looking for?

[@ryanhollingsworth1148]

Dumb question but how would a tapered 4-hole work on a edelbrock performer eps manifold?

[@cuttersperformance]

Not a dumb question. You'll probably have the best results with a flipped combo as the EPS is a dual plane

[@vestal2245]

How much ignition timing did it like?

[@cuttersperformance]

34 deg total

[@larryw5429]

Spacers work great unless you have no hood clearance like in 3rd gen F bodies!

[@cuttersperformance]

Yeah I feel that haha, they all need cowls

[@Thumper68]

My 68 RS/SS Camaro matching numbers 350 4 speed edlebrock intake holly carb 1 inch open spacer and standard 14” filter is all I can fit if I even get little taller filter it hits hood. My car got quicker with notice gains through entire rpm range. I also refreshed my engine it’s .020 over and has aluminum pistons and I also worked the heads with burr.

[@lordsauto]

Hey im trying to get a hold u. U mentioned to me once before about some vortec heads for sale thanks, LMK

[@cuttersperformance]

Sorry man I dont have any vortec heads for sale currently

[@lordsauto]

Its cool just wondering

[@yyoddball]

Following advise from an erlier video regarding vortec head valve clearance i got the SUM-174002 valve springs and recomended retainers SUM-174003-3 . my question is the cam i am going with SUM-174002 has a .505 lift and i am wondering if i will be ok with factory valve locks? i am using prw rollar tip self aligning 1.6 rockers and putting in the pioneer studs.

[@thehoule70]

Hey bud I just scored a GM lt4 cam kit 12480002 my question is I have a crate 880 motor complete can I use this cam kit with my original pushrods and roller valves the roller rockers are 1.6 and can I use the valve spring retainers on the kit I’ll appreciate any info

[@cuttersperformance]

The push rods should be close, the lifters can be reused. You will need upgraded valve springs

[@matthewrosario9638]

sure there are a shit ton of 305 chevy rotting away sir lets make 305 chevys great again

[@sc358.]

My assumption would be something like Hamburger's tapered dual plane spacer (4 hole but keeps true dual plane, divided) and a lot larger carb would be the way to go. I haven't tested it because the only application I run a dual plane on a build is a hobby stock dirt car and you want the engine to see all that carb, it's restricted to a 2bbl so it wouldn't make sense to maintain true dual plane. But I think in a budget BBC towing application with penut port heads, that kinda spacer and a large 4150 would work quite well. Wouldn't show up on the dyno but I'd prefer phenolic over aluminium. Think maintaining the dual plane would give you more meat under the curve and the large carb would feed it at rpm, maintaining the dual plane makes the carb seem smaller to the engine so probably has better throttle response and part throttle manners.

[@thehoule70]

Ohh ok awesome

[@thehoule70]

The heads are all stock on the crate 880 motor

[@bowtiebum82]

Do you have a part# for flat top pistons for l-31 std. Bore I know they are diff from that old 350 pistons

[@cuttersperformance]

You can use an old school flat top piston in an L31. The real difference is that vortecs use a smaller metric ring package on the stock pistons. But if you're changing pistons, you can use either

[@rogersome1413]

Do you have any experience with AFR 195 Eliminator street heads? On line they say that offset rockers aren't necessary, however the geometry on the intake rockers are horrible.

[@cuttersperformance]

Yeah ive used them with non offset rocker. Are you hsing a 5/16 or 3/8 push rod?

[@rogersome1413]

@@cuttersperformance 5/16

[@michaelverdugo4504]

hey sir i have a question about my set up i want to do i would like to get beehive spring for 96 vortec engine and a zz4 cam will my stock rockers and stock pushrods work with that cam i know my question has nothing to with your video but i have seen alot of your stuff on vortecs builds snd thought you would be a guy to ask great videos by the way thanks

[@cuttersperformance]

The stock rockers shouldn't be used with that cam, anything over .480 lift is pushing it. The stock push rods are good for about 300lbs of open spring pressure

[@michaelverdugo4504]

thanks for the info brotha

[@oscarpuente2029]

need to try that combination 2 inch spacer 5.7 small chey in fj 60 should do just fine.

[@flinch622]

Ditch the high volume oil pump: pressures suggest you don't need it.

[@cuttersperformance]

It was actually a stuck pressure valve in the new pump. Replaced it with another HV pump and oil pressure is right on

[@scotthultin7769]

Horsepower doesn't get you down to track torque those concentrate on your torque and peak torque

[@willammccoy1053]

I lost my old instagram account. Do you have a link.

[@cuttersperformance]

Search up Cutter's Performance and it should come up man

[@inscoredbz]

I have wondered how flipping a tapered spacer would act on a original Victor jr SBC intake.

[@bmac3394]

Yer 2" spacer upside down... That's strange.

[@cuttersperformance]

Did you watch the video? I did that on purpose

[@bmac3394]

@@cuttersperformance I see that. The results are strange.

[@cuttersperformance]

@bmac3394 upside down applies to a dual plane intake. Those spacers are made for single planes and should be used right side up on those.

[@slowcountryboy476]

Fix the sound on your future videos. Two thumbs down for you.

[@cuttersperformance]

Im currently saving up for some new audio and camera equipment

[@slowcountryboy476]

@@cuttersperformance 👍

[@davidtrue8956]

Hi do you have an email i have some questions thank you

[@cuttersperformance]

[e-mail]