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.

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 .

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

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- !

Good information as always! Waiting for the next one.

Thanks for the uploads ! 😎

Nice power from a budget build. Thank you

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.

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

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..

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

Great testing 👍🇦🇺

Good info!

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.

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

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.

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

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

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?

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

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.

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?

Thanks again as always cool info. I would like to see the gains that can be had on this combo with a decked block and windage/lightening/balancing modifications to the crank. Just the stuff that can be done with effort and a bit of machine work, and not throwing a whole lot of parts at it, and blowing the budget. Break the 450 hp. mark??

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.

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

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.

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.

. . 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.

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

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.

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.

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

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

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

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

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

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

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.

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

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.

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

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

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

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

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

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

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

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

How much ignition timing did it like?

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.

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

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

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.

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

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

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

You need a mic

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

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

I have a marine vortec engine in my 85 square body. Has the 395 roller cam, aluminum Volvo Penta intake manifoldI, and rated at 325 hp. I have a zz4 cam I have been wanting to use with 1.6/1.5 rockers, a Holley 3310, and try this spacer flipped. I would think the outcome would be similar in results than with no spacer just down a bit from the Hotcam.