[Redmanf1]

I have been considering installing an EFI system for my 71 chevelle convertible. I have been looking at the holley super sniper or the holley sniper stealth or ???.
All my lines and tank were replaced with stainless when I restored my car so I do not want to cut them. If I need, I could run AN lines next to them. Would I need to replace my tank with one with in tank pump?
Also I want to keep my cowl induction air cleaner. Has anyone done something like this?
I am running one of the 502 ZZ holleys and not really happy with it.
Engine 496, RPM intake, Brodix heads. ready-to-run MSD 8360 dist and turbo 400 trans.
Fuel lines 3/8 and 5/16 return.

Thank you in advance for any thoughts and ideas.

 

[carsverboten]

I put an Edelbrock pro flow EFI system in my 71 chevelle convertible. I have a 350. I used an external electric fuel pump, kept my original fuel tank and used a vented fuel cap. You don't need the vapor lines or the charcoal canister but you can leave them installed. I put in a March serpentine system and the new AC pump is far superior. I also have cruise control. The car performs much better. The 700R transmission makes it better yet.

 

[Bronze68]

I run a Holley Terminator on my 71 BBC. Could not be happier. I recommend getting a fuel pump in the gas tank. I went with a new Tanks unit complete with the Aeromotive pump. Keep in mind you will also need a return line. If you're going for a totally stock look at the engine, you'll need to get creative as typically AN fittings are used in these applications and you'll need to find a home for the regulator as well. You can make your factory style fuel lines work, but you'd be foolish not to use an inline fuel filter so that may alter your decision. I ended up spending the money on braided hose for both lines and left it at that.

 

[Redmanf1]

My car has the factory return line. Can any of these systems be used with an external pump back at the tank?

 

[Jim's69Ragtop]

I haven't made a purchase yet, but I did a lot of research on what would be needed to install the Holley Sniper. Like you, I was trying to avoid replacing my tank and the fuel lines if possible. The parts below include an OEM style fuel pump which will retrofit your existing tank. The return is built into the pump, so you don't need a separate return line. My car has the 5/16" line, so Holley recommended I still run a 3/8" line. If you already have a 3/8" line, you can use that, you just need to replace the rubber hose at each end with the higher pressure line and clamps.

jim

 

[Monkey]

I have pro flo 4 on my 400sbc with edelbrock sump in engine bay. probably would do a full tank setup if i did it again but i love it.

I didnt choose the sniper kits for all the complaints about RF noise and them being very picky, and i like the 8 injectors.

 

[Redmanf1]

Looks like the Pro-flo 4 EFI 35860 would be a problem with my AC bracket and not sure it would fit under hood with the height of the intake.

 

[toofastforyou]

I bought the Holley Sniper throttle body and since my car already has a 1/2" fuel supply line, all that's going to be needed is to add a return line and an in-tank pump. I plan to have everything installed next spring as the car is stored right now. I'm hoping to find a pump that'll fit in the stock tank...
Claude.

 

[67_LS1]

i have EFI on my Chevelle and used an external pump and a bypass/return style filter. Both mounted inside the frame rail under the passenger side door.

I used rubber EFI fuel line and quick connect fittings to adapt wherever there were push connect adaptors.

I used the same system on my 67 and had 100k miles without issue.
for the return from the filter/regulator I connected to the original tank vent and added a vented cap.
i can hear the pump when I first turn the key on but not when the engine is running. And my car is pretty quiet.

 

[kmakar]

I'm teetering between holley sniper and edelbrock (but leaning towards Edelbrock Pro Flo 4) for a Pontiac Lemans convertible (making it a GTO clone) with a 455 and a TH400. Was my brothers car (he bailed on the project as I was working on it for him and gave it to me), so I'm considering some upgrades now since it's mine. It currently has an edelbrock performer and a holley 850cfm.

 

[1966Chev]

i have EFI on my Chevelle and used an external pump and a bypass/return style filter. Both mounted inside the frame rail under the passenger side door.

I used rubber EFI fuel line and quick connect fittings to adapt wherever there were push connect adaptors.

I used the same system on my 67 and had 100k miles without issue.
for the return from the filter/regulator I connected to the original tank vent and added a vented cap.
i can hear the pump when I first turn the key on but not when the engine is running. And my car is pretty quiet.

Nice Installation! What fuel pump and regulator did you go with? I have a 66 Chevelle and I need a new electric fuel pump.
Thanks

Eric

 

[67_LS1]

Nice Installation! What fuel pump and regulator did you go with? I have a 66 Chevelle and I need a new electric fuel pump.
Thanks

Eric

The pump is a Holley and the filter/regulator is from a C5 Corvette. If you type in Corvette fuel filter/regulator you’ll get hits showing it’s pretty popular route for LS swaps.

 

[BobinPA]

I am using a terminator stealth. I installed a new fuel tank with in-tank pump. I put the bypass regulator at the tank ala C5 corvette, and ran a 3/8" hard line to the unit. I ran the fuel line in the same basic area as the original fuel hard line to the carb. Instead of the corvette regulator I used an adjustable Holley billet regulator, as the LS motor uses a higher fuel pressure than the stealth. Works fine. I maybe see a half a psi change in fuel pressure from idle to wide open. I used a drop air cleaner base from a BBC C2 Corvette that came factory with a dual feed Holley carb. Probably a 425 HP 396, but I dont remember. It dropped right onto the Stealth unit. I ran the wiring out the back of the engine and hid the ECU under the inner fender. You have to look close to see it is not a carb fed engine.

 

[Redmanf1]

Would the external pump work ok being about tank level? I was thinking I could put the inline pump and PR filter right at the back of the tank. I would come out of the tank to the pump going to the left then circle back to filter- pressure regulator then run the return line back into the tank and pressure line to the stock fuel line. I think there is room. My car being a convertible I do not have an open frame to put pump and PR filter like pictured above.

.
.

 

[67_LS1]

My 67 had the inline electric pump mounted right near the tank on the crossmember. It worked fine.

 

[OLDED]

What is your "all in" cost - not what you told your wife, LOL

 

[67_LS1]

What is your "all in" cost - not what you told your wife, LOL

Holy Crap! This is a topic for a totally different thread with ability to be double locked down from spouses prying eyes. And probably coded in a TBD “Chevelle Lanquage” that only true Chevelle gear heads could comprehend.
Even then I’m not sure the smartest among us would risk their very lives forwarding a number even close to the truth, even if they knew it themselves.
The risk is just to great.

 

[Raven1]

No problems with all my non efi classics. Must be a new mentality with you guys switching over. My buddy's wife drives her classics daily with carbs and could not care less about efi. Yep. That's right.
A chick who digs cars and does not gripe about money spent on them.

 

[cage2592]

No problems with all my non efi classics. Must be a new mentality with you guys switching over. My buddy's wife drives her classics daily with carbs and could not care less about efi. Yep. That's right.
A chick who digs cars and does not gripe about money spent on them.

I think it mostly has to do with both, people not bothering to learn or lack of understanding these days. Although I do enjoy tuning on newer cars. Which most don't bother to do either on these EFI kits. A shame since they spend the money but dont follow through with a tune. I just cant justify the $2000+ cost to switch everything over from a perfectly tuned CARB.

Although if I was to switch over, It would be the Sniper Xflow. A few friends run that model and I like the x4 120 injectors and 900CFM throttle body and x3 programmable input and outputs.

Mike

 

[Redmanf1]

I am looking at the holley terminator X Max stealth 550-1014 $2200 and the holley OEM style fuel tank module 12-303 $324 then some odds and ends. I think this system is more adaptable in case I want a bigger motor and overdrive trans or just use it on another car. So I would say about $3K all in. You can get the one without the trans control for $1950.