Holley Terminator Stealth EFI Installed - 1968 Chevelle SS

[@sskillett]

Have a similar install on my 66 GTO with a .030” over 455 Pontiac engine. My car appears stock, and very few notice that it is not carbureted. The engine was dyno’d at 565hp, idles at 850 rpm and has 11:1 compression and a solid roller camshaft. My engine has aftermarket aluminum heads and intake so it looks slightly different than 100% stock, but still pretty “stealthy”.

[@andrewchemello5011]

I saw some videos of your car and it looks fantastic. Have you drag raced it with the terminator stealth? I raced mine last month and it ran 12.48 @109 MPH

[@sskillett]

Andrew Chemello I have not yet raced it. The car still has the stock 10 bolt, and I didn’t want to crater it. The car is primarily a street car, but I would like to see low 12s minimally. I have a mid-12 second pickup and the car certainly feels faster.

[@dougmarthaler3066]

Nicely done video! Super informative, good audio & video, excellent camera work and content.

[@SS454LS6]

Thanks!

[@snake_eyes_garage]

You guys did an awesome job on this video! 👏😎 Kudos to you both.

[@72MrHotrod]

Man that looks so clean, he did a great job on the installation! 👍 Only wish i could have heard at the end 😆 lol

[@trickyrjb1]

I believe i would have banged on the drop breather with a ballpeen. Btw that 2" drop breather is going to restrict air. Maybe use a filter top.

[@andrewchemello5011]

I happen to think that gm got it right. It was on the highest horsepower engines of the day. This OEM air breather assembly is low profile and has a ram air effect from the top. It is clocked to prevent it from moving. I don't prefer to bang on things. I just make them work. Good luck with your project.

[@andrewchemello5011]

My car has a big block and the big block hood. Unfortunately the SS hood doesn't give you more under hood clearance. You can have a better look at the car if you subscribe to this channel and look at the fuel mileage video. It is a Canadian built SS with Verdoro green paint only available in Canada.

[@75zl1]

Dang I saw the tag and watched it without sound.. That is amazing how stock that appears! I have the proflo 3 on my car. I like the tunnel ram look, but if I knew this was out there that would have been awesome!

[@SS454LS6]

I think the Proflo systems look amazing and I would really consider getting one if I were to do it all over again.

[@cuzz63]

I would have modded the air cleaner before taking a hacksaw to the Throttle Body..looks good though. They make vacuum hoses that are thinner so you dont have to grind the hose, but Holley should have given that a little bit more space..I think the fact that the fuel is being constantly circulated while running will keep it cleaner and you went with a new tank. probably the 10 micron will clog up first if it were to clog. Changing it yearly seems about right..

[@larrymazzola4375]

Amazing install, a man that shares my OCD. My friends think I'm crazy. Any chance to make a parts list for the stock appearance fuel rail you made and exactly what you did to plug up the end. Thank you

[@andrewchemello5011]

No part list as everything is custom. Flaired one end with a double flair tool and other end with a 6 AN flair tool while keeping it as short as possible. The fuel distribution block is brass and I filled the hole with a small brass plug and braised it in. These details look great, but they took awhile to create. Good luck the results will be worth it and your friends will be amazed.

[@falfighter]

nice clean install.

[@terrybaltimore1542]

Great build...

[@kentlewis988]

As others have said - "nice clean install!". Will probably use some of your ideas if I do an install on my '68. Also, thanks for pointing out some of the systems "short comings". Its difficult to understand why the engineers(?) who designed this system - simply "missed the mark" on what would have been a absolute home run had they got the details right. Things like: Why are the fuel covers on the end of the EFI unit NOT the exact size/shape of the stock Holley carburetor fuel bowls? They claim it looks like a stock Holley carburetor, yet they chose to run a wiring harness along the outside of the throttle body? And as you pointed out, the vacuum port is not sized for a stock PCV hose? They were SO close...then simply fumbled the ball...disappointing.

[@andrewchemello5011]

Good luck with your 68. I have had my terminator stealth for 2 years now. It did need some minor tweaking. I replaced the PCV valve with a fixed orifice type to give the system a consistent leak. I had a stumble @2000RPM. The solution was to change the acceleration enrichment from 53 baseline to 17 and the stumble went away. My car runs quicker at the dragstrip and fuel mileage is great.

[@ezelk1337]

Great job on the install. Beautiful car. I am wondering how much did the mileage go up after adding the FI system? Thanks

[@andrewchemello5011]

Don't know exactly but it was noticeable.

[@BBBILLY86]

Nice system. Are you still running this 3 years later and happy with it long term?

[@68chevelle17]

Yes it is running fine. Always trying to find more torque and horsepower with what I got lol

[@kravmaga7070]

great job but 3800 cdn prices me right out nevermind the tuning by a shop probly required. plus, the fuel pump, plus the fuel tank setup, etc etc etc

[@mattmcdaniel6219]

Ya just grind on a 1500$ kit to make a breather fit, f#*÷ money! 😅 lol

[@leatherwoodjay]

He is losing horsepower on the drop air filter kit. He took 2” of headroom out that throttle body. That makes a big difference on a carburetor but maybe on a system like this the computer adjusts for the extra richness from losing so much air volume.

[@LaithFaouri]

That's looks great 👍🏼 how is the MPG before and after?

[@68chevelle17]

Great question I haven't compared the fuel mileage since the rebuild. Keep watching this Channel. We may have to do a fuel comparison again

[@jimbaggio6011]

Very informative. This is the same combination / setup that I'm contemplating. Just wondering how much cam you are running and what the manifold vacuum was that you had before.

[@andrewchemello5011]

The cam is a GM mechanical flat tappet. Intake lift .496 Exhaust lift .492 Duration @.050 intake and exhaust 242 Lobe centerline 114 degrees. Vacuum was 10 inches and is more than 11 now.

[@jimbaggio6011]

My mechanical cam has a bit more lift .575 intake / .604 exhaust Duration @.050 intake 242 and exhaust 250 Lobe separation is 110 degrees. I'll have to check on my vacuum because I understand the self-learning function doesn't tune well with less than 8" vacuum. I'm assuming yours to be a dual plane intake? Also do you think that the air cleaner base could also be modified for clearance?

[@andrewchemello5011]

@@jimbaggio6011 Yes I do have a dual plane intake. The original GM air cleaner base is clocked to keep it in the same position. If you grind it down it will no longer be clocked and you will have rubbing on the throttle body. Aftermarket air cleaner bases are not clocked and they should fit with no modifications required.

[@jimbaggio6011]

@@andrewchemello5011 Yeah, I'm just concerned about voiding the warranty. GM's original has a 2" drop base, and Holley's drop base is only 1" (not enough for hood clearance with the stock hood on my car)

[@andrewchemello5011]

@@jimbaggio6011 I taped up the top and bottom throttle plates before the surgery. As long as no debris gets into the throttle body they should warranty it. Maybe they will see my video and incorporate it into the next generation design.

[@robmotown1]

Is this a joke?…? Why would you modify an expensive throttle body when you could modify an inexpensive piece of sheet metal??

[@68chevelle17]

Factory air cleaner assemblies are clocked so they don't spin. The throttle body is generic and after the minor modification it will be like an oem holley carb. No sin or damage done lol

[@phillipperrin9388]

Nice Chevelle !!! You made a comment about the smell of a carburetor after you install the new EFI, can you tell me what about the smell is it still like the old carburetor ?

[@68chevelle17]

The carburetor may have a small amount of fuel that trickles down the intake manifold after shutting the engine off. I had the float level a little high to prevent fuel starvation at high RPM. This causes a gas smell. Especially with an open style air filter. EFI injectors stop the fuel as soon as the fuel pump is shut off. This doesn't have a raw fuel smell when shut off

[@itachi20007]

How many amp alternator did you end going to to support all the efi I think I got 110 amps right now I assume I'll need a bigger one

[@68chevelle17]

I currently have the stock alternator and I have no power demand issues after installing the EFI and MSD ignition.

[@Danno74Z]

Hello, Really found the video informative. This Holley Terminator Stealth 4150 is about $1,000 more than the Sniper. I have reservations with the Sniper long term because the the ECM is mounted on the throttle body. This is a horrible environment for a ECM and not one OEM puts the brains of the FI system on top of a hot engine. Perhaps I'm wrong on this. Most put it well off the engine where the heat and vibration has to be 2/3th less. Also EMI seems to be an issue with the Sniper especially with FORD engines as the distributor and ECM are facing each other. Lots of stray EMI comes out of a distributor. What I don't like about either system is on the hand held there is no oil pressure displayed. WHY? Maybe I'm wrong so please correct me. To spend this type of money and not get a oil pressure reading is ridiculous. Just have a drop down to ask what type of engine and buy the sensor and then configure it on the hand held during initial setup. EASY.

[@68chevelle17]

You are correct with the ECM and I was a little disappointed with no oil pressure reading. I saw a video of someone adding the oil pressure sensor wiring to the sensor but I haven't tried it yet

[@martinellul1604]

9:15 Matrix Glitch lol

[@silverstrikemoonlight5691]

How does it perform vs the carburetor? I’m looking at this myself for a small block ford in a pickup. I’ve seen the terminator stealth used with dual plane manifolds where most other use a single plane victor. I’d like to retain the dual plane myself as mine is built for as much low end as possible. Are you happy with the performance over the car you had on it?

[@silverstrikemoonlight5691]

Carb*

[@andrewchemello5011]

I have had a carburetor for 25 years on this engine. The engine has a dual plane intake manifold and I have a 3/4 inch phonelic spacer between the throttle body and intake. The performance is slightly better at the dragstrip, but the street is where the part throttle and fuel mileage is noticeably better than with the carburetor.

[@jimdouglasgregory]

So am I assuming that the fitech does not have the same level of resolution on the tuning tables?

[@SS454LS6]

Correct. The FiTech only uses a learn 3x3 table. The VE table is only 6x8

[@jimdouglasgregory]

@@SS454LS6 in your opinion is that a big enough reason to go Holley over fitech? I think their sniper units have the same amount of resolution. I'm debating how to go forward on efi for my 1966 Caprice

[@SS454LS6]

@@jimdouglasgregory I am pretty certain the Sniper uses a 9x9 table. It is not the same ECU as this Terminator kit. Sniper/FiTech are virtually the same. This Terminator Stealth I would say is a level up, but a bit more expensive.

[@jimdouglasgregory]

Okay thanks for the info :-)

[@armygreenfj3924]

Is he still running this unit?

[@SS454LS6]

Yes

[@armygreenfj3924]

@@SS454LS6has he had any problems with it? Im thinking of getting the terminator x efi.

[@SS454LS6]

@@armygreenfj3924 There might have been an issue with the Holley Dual Sync dizzy when he first got it, but for years it's been tip top and very reliable.

[@armygreenfj3924]

@@SS454LS6 awesome thanks!

[@68chevelle17]

I am learning more everyday about my holley efi. I am currently installing an oil pressure sensor, trans speed sensor, and 2-step through the holley. And I have updated my software to V6. All my drag race runs will have more data. Data logging is amazing and the price for efi is worth every dollar.

[@jaymondperry5106]

What fuel filter did you use?

[@andrewchemello5011]

Performance World 95206 -6AN 10micron billet fuel filter. Good luck with your installation

[@basketballcory2]

Rich for racing??

[@GhostRyder305]

Very nice set up, I'm going with a Terminator Stealth as well. Do you sell the diagram, because I would like a copy if so.

[@andrewchemello5011]

I found the diagram online and it is coloured. The one supplied with the kit is black and white. I photocopied the one online and took it to staples and got it blown up for a few dollars. One thing to note if you want to control timing with a dual sync distributor it will require a laptop and a special cord to program the pcm v4 software when you first set all the parameters

[@kountrylr23]

What fuel pressure regulator did you use?

[@andrewchemello5011]

I used a Holley 12-880 fuel pressure regulator. I tried to use all Holley parts on the fuel system

[@kountrylr23]

@@andrewchemello5011 Thanks. Will be using some of your ideas like reusing the stock fuel line. Overall very clean install. Thanks for the reply and very detailed video.

[@caseyburnett6530]

“I run my AFR rich for racing and I don’t like the smell of gas.” Lol ok buddy

[@SS454LS6]

He's able to run it on the richer side and yet his EFI doesn't stink up the garage like the carb did. Perhaps a bit of a contradicting statement but the that's the real life results.

[@frankdatank7751]

Turn it on

[@HairBandDan]

Damn that’s a lot of work, for now I’ll stick to my 750DP

[@68chevelle17]

Alot of work installing it but 3 years later it is worth all the work. I will never go back to carburetor

[@HairBandDan]

Well I’m back and looking at a Holley efi tired of raw fuel smell when starting 🤦🏼‍♂️

[@68chevelle17]

I had the same problem lol

[@Ltngdrvr]

Why the heck didn't you bust it off and show it running, maybe even driving???

[@SS454LS6]

Unfortunately it was still winter. You can see it run a couple videos I have posted.

[@Ltngdrvr]

@@SS454LS6 What? BBC won't run in the cold?

[@SS454LS6]

@@Ltngdrvr BBC gets stored for 7 month long, and -40C winters. Unfortunately it wasn't ready to run that day.

[@Fatnlo]

Instead of modifying a cheap air cleaner base you cut into a new sniper unit?! 🤷🏼‍♂️

[@andrewchemello5011]

Actually the GM 2inch drop base air cleaner is expensive and rare. It is required for my application because of the low hood clearance and I want to keep the stock appearance. The cuts on the throttle body are quite harmless and will not have air leaks with any other air cleaner base. Good luck with your project

[@approachingtarget.4503]

Wooo. I stopped watching as soon as you pointed out you cut the injection unit instead of the thin tin air cleaner base. Proof that even if you have the money. Doesnt mean you shoukd do it.

[@andrewchemello5011]

Thanks for the reply. This modifying the throttle body has come up a few times and I would like to clarify. It took me half hour to cut the throttle body when it would've taken many hours to modify the air cleaner. The throttle body was not damaged in any way.

[@dandorris8531]

If you’re going to do a review, finish it off by starting the car good grief.

[@andrewchemello5011]

Sorry winter time in Canada. Car is snowed in.

[@bradclark2922]

It's supposed to smell like gas, because that's what real men smell like! I do like EFI though...