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Converting 1970 396 to Fuel Injection #5351971 02/16/20 05:47 PM
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007 Offline OP
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I am considering converting my 1970 Chevelle 396 to Fuel Injection. Sounds cheap up front but I am wondering how much the swap will cost me real time. Ideas and opinions appreciated as this is a numbers matching car.

Thanks!

Re: Converting 1970 396 to Fuel Injection [Re: 007] #5351983 02/16/20 05:56 PM
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ls1mike Offline
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What type? Like a TBI setup?


Mike
00 Trans Am WS6 5.7 LS1
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Re: Converting 1970 396 to Fuel Injection [Re: 007] #5351986 02/16/20 05:58 PM
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A_Harman Offline
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Are you thinking of converting to port injection, or throttle body injection? The number of options out there are bewildering. What are your ground rules going in? Do you want to buy a self-contained throttle body unit that bolts to the stock intake manifold?


2008 Dodge Ram 3500 diesel/G56
1985 Z51 Corvette track car 355/6-speed
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Re: Converting 1970 396 to Fuel Injection [Re: 007] #5351988 02/16/20 06:01 PM
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JasonC Offline
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Several years ago I converted a 1981 Pontiac Turbo Trans Am to EFI. I used the MSD Atomic EFI system. Costs have come down, but I had probably $3k in the whole system including fuel tank, ignition, etc.


2012 Buick Verano 2.4
2006 Ford Mustang GT Convertible
Re: Converting 1970 396 to Fuel Injection [Re: 007] #5351991 02/16/20 06:02 PM
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Propflux01 Offline
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Re: Converting 1970 396 to Fuel Injection [Re: 007] #5351992 02/16/20 06:02 PM
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FlyNavyP3 Offline
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I have installed a few retrofit EFI setups ranging from TBI self learning plug and play to full sequential multi point conversions. For the look of OE, quality of aftermarket support, tuning capability, and expanded capability should you want it, look no further than the Holley Terminator Stealth. If you get one with transmission control and want to add a 4L80E down the road, you're covered. Want to have the ECU control timing, in addition to fuel, you can do that too. Fuel system, you can keep the stock tank and run an EFI surge tank, or convert to a drop in EFI tank.

I'm currently building a hydraulic roller square port 496 for a 68 Chevelle. Owner is going from a 396/TH400 to a 496 with Holley Terminator Stealth and a 4L80E, Holley will be controlling fuel, spark and transmission.


Luke
P-3C and P-8A Maritime Weapons and Tactics Instructor, Instructor Tactical Coordinator and Mission Commander
Re: Converting 1970 396 to Fuel Injection [Re: Propflux01] #5351995 02/16/20 06:03 PM
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Imp4 Offline
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Originally Posted by Propflux01

Geez, not for the faint of wallet. Nearly $4k......

I know nothing about these things.
Does something like this do a better job (performance, reliability, economy, etc) versus a more reasonably priced option?


2001 Mitsubishi Galant 2.4 - 165k+
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Re: Converting 1970 396 to Fuel Injection [Re: 007] #5352000 02/16/20 06:15 PM
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bdcardinal Offline
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The Holley systems are the way to go now.


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1995 Ford Mustang GT

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Opinions expressed are my own.
Re: Converting 1970 396 to Fuel Injection [Re: 007] #5352010 02/16/20 06:27 PM
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Char Baby Online Content
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My buddy just converted over to TB-EFI on his '61 Vette w/350cid GM Crate Motor. His cost ~$4500 when as was done.


Retired 6 yrs now & lovin' it
-----------------------------------

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Re: Converting 1970 396 to Fuel Injection [Re: bdcardinal] #5352015 02/16/20 06:33 PM
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OVERKILL Offline
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Originally Posted by bdcardinal
The Holley systems are the way to go now.


Agreed. I'll be using one on my parent's boat unless I can magically find a fully intact marine EEC-IV system in the interim.


2019 RAM 1500 Sport - Mobil 1 EP 0w-20, FRAM Ultra
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Re: Converting 1970 396 to Fuel Injection [Re: 007] #5352035 02/16/20 06:54 PM
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atikovi Offline
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Funny how this has come full circle. When FI started becoming popular in the 80's, everybody complained how mysterious and complicated it was and the average home mechanic won't be able to work on it. Now people are paying a premium to convert old cars to it. Why do you want to convert?

Re: Converting 1970 396 to Fuel Injection [Re: Imp4] #5352038 02/16/20 06:57 PM
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maxdustington Offline
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Originally Posted by Imp4
Originally Posted by Propflux01

Geez, not for the faint of wallet. Nearly $4k......

I know nothing about these things.
Does something like this do a better job (performance, reliability, economy, etc) versus a more reasonably priced option?
$4k USD is the cost of an LS swap, those high dollar MPFI kits are the sort of things you saw in early 2000s car mags. Completely obsolete as anyone who needs MPFI will just swap in a motor that was designed for it these days.

That's $4k for a canned tune that you might not be able to change easily. You might as well just go with a custom tune on a truck TBI, which is closer to what the Holley systems are but self tuning.


99 Toyota Tercel CE 5EFE/C151
PUP 5W30/Ultra
Re: Converting 1970 396 to Fuel Injection [Re: atikovi] #5352042 02/16/20 07:02 PM
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maxdustington Offline
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Originally Posted by atikovi
Funny how this has come full circle. When FI started becoming popular in the 80's, everybody complained how mysterious and complicated it was and the average home mechanic won't be able to work on it. Now people are paying a premium to convert old cars to it. Why do you want to convert?
The mechanic's boogeyman changes every decade or so. New carb = 500-$700 USD, EFI system $1500 USD + fuel system upgrades. No one is going to be able to service Quadajets in a decade or so and they will only exist in museums.


99 Toyota Tercel CE 5EFE/C151
PUP 5W30/Ultra
Re: Converting 1970 396 to Fuel Injection [Re: 007] #5352049 02/16/20 07:13 PM
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atikovi Offline
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If a part like the crank sensor goes bad on a fuel injected car, the engine is dead. If the carb is bad, it may run like crap, but at least it still runs.

Re: Converting 1970 396 to Fuel Injection [Re: 007] #5352070 02/16/20 07:33 PM
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DONWATERS Offline
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I have 69 and 71 SS 396 camaros, both 4 speeds. They have the original quadrajets, with epoxied fuel bowls and bushed throttle shafts. Both have Crane 272 cams. They run fantastic, good economy and performance. I would never pay $$$ for the hassle of aftermarket FI with all sorts of sensors you can only get from them. They do have HEI distributors though.

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