Mystery! - Weird '6bbl' 409 Chevy F.I intake - Can anybody I.D???

Mystery! - Weird 6bbl. 409 Chevy F.I. intake
- Can anybody I.D???

I saw this 409 Chevy '6bbl' fuel injection
intake over on the 348-409.com list
(www.348-409.com/forum/showthread.php?t=18908#post136936)
but nobody there can I.D it either. It
appears to be from a 409 marine engine
of some sort, but that's all that anybody
can figure out. Does anybody know for sure
what it is, who made it, when and what the
original application for it was? I know I've
never seen anything like it!

Mart3406
==============================

 

Boy, DON'T KNOW???

Never seen such an intake??

What the hell is is??

Way cool tho.

pdq67

 

wow Thats a wild one the butterflys cast in the intake ?

 

I've seen that thread also. Seems Chevy had some stuff up their sleeves we didn't know about.

The following pictures were captured from Ebay many years ago. The story is there were six test truck engines built for fuel injection. And they weren't sold, but in a development contract of some sort. GM collected them at the end of development phase and one survived the scrapper because the truck was down for some other maintenance problem.

Now that story being told....I have NO way of knowing the veracity of it. From memory, the Ebay seller told much of it that way. I don't know who bought it, nor do I remember the price. I simply collect digital photos from all sources for my personal collection.

So, here we go:

 

Wow!!!

 

Actually no. Check closer, it's a throttle body bolted to the intake.

And the angle on the throttle body doesn't appear to be marine. Marine engines had a much sharper angle.

My guess since there is an absence of numbers on it, it was experimental truck development setup.

 

No clue here but is it ever one cool SOB!Make a hell of a wall hanger in the shop.

 

Don't know what it is! But it looks like a really great place for a 6-71 to me.

Tim

 

That is supremely kick ass. Would there be any way to actually run it on an engine? I'd put that bitch on my W if there was any way to make it work.

 

------------------
There probably is a way.....*if* you could
ever find one of these intakes. It looks like
it'd be a natural to convert to EFI - fabricate
a couple fuel rails and some throttle linkage,
plug some electronic injectors into the
existing mechanical injector holes in the
ports and use a micro-squirt or other
controller!

Mart3406
============================

 

any chance that is diesel prototype?

Just wondering...like the big iron V6 GMC was supposed to be a diesel, but ended up as gas.

 

no throttle blades on a diesel.

 

-----------------------------
Nope. Not possible. Diesels have to have
their fuel injected directly into the
cylinder and always at or very near the
point of peak compression. The manifold
in question is set up for port injectors, so
it's definitely from a gas burner. Also, it's
got throttle plates to control and 'throttle'
the amount of air flowing into the intake,
something a diesel has no need of.

Mart3406
===================

 

sorry dude GMC made several v6 diesels mainly 478 ci v6 toraflow,a 351{rare}and if i remember right a v12 702 diesel not gasoline engs

 

Look close at the throttle body, it looks like three 2G bases hacked up and bolted together.

I'd guess home brew.....

 

-------------------------------
The 478 V6 was made in both gasoline
and "Toro-Flow" diesel versions, but the
others you mentioned - the 351 V6 and
the 702 V12 were all gas burners *only*.

Mart3406
===========================

 

Yes, but GM may have done it that way for development/testing. It doesn`t explain the injector holes. Looks like the truck prototype, but that appears to have 4 butterflies.

 

<table id="post5610640" class="tborder" width="100%" align="center" border="0" cellpadding="6" cellspacing="0"><tbody><tr valign="top"><td class="alt1" id="td_post_5610640" style="border-right: 1px solid rgb(229, 229, 229);">Re: Mystery! - Weird '6bbl' 409 Chevy F.I intake - Can anybody I.D???
<hr style="color: rgb(229, 229, 229); background-color: rgb(229, 229, 229);" size="1"> <!-- / icon and title --> <!-- message --> Quote:
<table width="100%" border="0" cellpadding="6" cellspacing="0"> <tbody><tr> <td class="alt2" style="border: 1px inset;"> Originally Posted by squirrel
Look close at the throttle body, it looks like three 2G bases hacked up and bolted together.
I'd guess home brew.....
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</td> <td class="alt1" style="border-width: 0px 1px 1px 0px; border-style: none solid solid none; border-color: -moz-use-text-color rgb(229, 229, 229) rgb(229, 229, 229) -moz-use-text-color;" align="right"> <!-- controls --> </td></tr></tbody></table>

------------------------
Around that time - early & mid 1960's - Rochester
was working on a 'unitized' 6bbl carb that was loosely based on three 2GC 2bbls in a common body, as possible replacement for 3-2bbl setup used by Pontiac, but it never reached production. My first thought when I saw the pics of this intake with the 6 throttle plates was that maybe that's what it was, but that wouldn't explain the injector holes in the ports.

Mart3406
=========================

 

GM was also developing a Rochester fuel injection intake for the 348... it was just like the SBC version, only for the W engine.
Lamar Walden has it now.
Lamar's also got two factory turbo-charged off-shore 409 boat engines. I've seen a write-up on the boat from long ago. Someone called him a couple decades ago and asked if he wanted the engines before the sunk the wooden boat in Lake Lanier.
The turbo's, intakes, etc. are all GM part numbers.

I've never looked past the turbos to study what they actually feed into. I don't know if there's carbs there or not. Lamar THINKS the heads are Z-11, but has never checked.

-Bra

 

The throttle body angle wouldn't matter on a fuel injected engine since there aren't any floats to deal with like on a carbureted manifold.

I'd expect an automotive intake for a street car to have a water crossover and a breather tube, as was used during the era.

 

In 1964 I aquired a Corvair Engine that had come from Chevron Research
in Richmond Calif. It had holes all over it for sensors that I had to plug up.
That could explain what you are calling "Injector holes". When they are testing,
they measure all kinds of things.

 

I agree that it looks like three hacked up 2 bbl bases welded together. Got to be some kind of FI prototype. Manifold has no provision for thermostat or PCV fitting and a wierd ass distributor base. I'm subscribing just to find out more. Didn't the true Z11 motors have a separate t-stat housing?

 

In early 80s saw a unit for sale in Cars and Parts ,was aftermarket for 348 trucks because of bad fuel mileage,not many were sold, dont know the brand name , this is a quite rare unit, although not a performace FI , and not GM to my knowledge Rusty

 

The Z11 intake has the runners and plenum in one part, with a separate valley cover that has the water crossover and distributor mount. AFAIK, all intakes for the Z11 heads, both original and modern aftermarket use this 2-piece type of setup.

 

Z-11 intake/ The best picture I have

 

Z-11 Intake Pictures

 

Pictures saved!... Thanks Wrench!

 

I recollect a single 4 bbl intake upper for the Z-11. I had a photo somewhere of it, but cannot find it. It was on my old website hard drive that got hacked.

If anyone needs photos of 348-409 parts, engines, cars, etc. I have thousands of pictures I never even added to the old site. Just ask....I'll likely have a shot of the part on some form.

I even have a pictorial tear down of the Mystery Engine.

Here's another of the Z-11.

 

Hell Yes!! Please post those pics!!! Thanks again Wrench!

 

I started another thread on the Mystery Engine.

http://www.jalopyjournal.com/forum/showthread.php?p=5825591&posted=1#post5825591