Vortec 7400

[JoBy]

I would like to see pictures of the upper and lower halves of the intake manifold.

 

[454ss]

check e-bay, i have seen a few for sale on there and they showed a picture of both the upper and the lower.

[JoBy]

Thanks! I have searched there now, but I did not find anything now.

[Larry]

What exactly do you need to see? I have a marine L29 intake manifold in my garage awaiting transplant into my 1978 K10. The marine L29 intake is very similar to the L29 454’s used in the trucks. The main difference is the marine variant is powder coated and free of all emissions components.

 

I can pull off the upper plenum if you need pics of the fuel rails, etc.

 

 

[JoBy]

What exactly do you need to see?  I have a marine L29 intake manifold in my garage awaiting transplant into my 1978 K10.  The marine L29 intake is very similar to the L29 454’s used in the trucks.  The main difference is the marine variant is powder coated and free of all emissions components.

 

I can pull off the upper plenum if you need pics of the fuel rails, etc. 

 

Thanks! That would be great!

 

I would like to see what it looks like with the upper plenum off, and the underside of the upper plenum. Also what the underside of the base looks like.

 

I am trying to figure out how the air is routed thru the intake.

 

Also, does this intake fit 'older' BBC engines. I guess it does if you are going to use it on a 1978 K10.

 

[Larry]

Here you go….

 

Just out of curiosity, why are you asking for these pictures? Are you working on a retrofit to an older 454?

 

I am not sure if this intake fits all big blocks but I think it is safe to say the L29 454 fuel injection intake will fit any BB with oval ports regardless if the intake is Marine or light truck. The 454 in my 1978 K10 is actually a 2000 model year GM Performance Parts Gen VI block so I do not expect any issues. I am currently rounding up GM Marine pieces to make it run. Hope to have everything by spring. The most expensive parts will be the marine PCM and Aeromotive fuel pump.

 

[JoBy]

Here you go….

 

Just out of curiosity, why are you asking for these pictures?  Are you working on a retrofit to an older 454?

 

I am not sure if this intake fits all big blocks but I think it is safe to say the L29 454 fuel injection intake will fit any BB with oval ports regardless if the intake is Marine or light truck.  The 454 in my 1978 K10 is actually a 2000 model year GM Performance Parts Gen VI block so I do not expect any issues.  I am currently rounding up GM Marine pieces to make it run.  Hope to have everything by spring.  The most expensive parts will be the marine PCM and Aeromotive fuel pump.

 

Thanks!

 

I have a 2000 Chevy 3500 with the Vortech 7400. A friend of mine is thinking about turbocharging a bigblock chevy and he wants fuel injection and keeping it under the stock hood. The Vortech 7400 looked like it might be a good intake to use. I did not want to take mine apart just to examine the ports and the insides of the intake.

 

Thanks again!

[Larry]

I was hoping you were going to tell me that you were another nut like me throwing benjies away like they are free just to get fuel injection on a 25+ year old rig.

 

Tell your friend he is better off going with a light truck L29 EFI system as the OBDII mass air flow calculated fuel delivery is much more forgiving of supercharging (never heard of anybody turbocharging a BB before), high lift cams, and in most cases can still sneak past emissions testing, etc. The marine set up that I have runs on speed density fuel calculations, which means the PCM must be programmed with my exact engine and drive train specs. Not as forgiving for future engine upgrades or emissions but can turn out more HP with the right calibrations. I am going the marine route for the sake of not running OBDII, using a much cleaner wiring harness and I do not have to worry about emissions in my area. Plus the new marine intake only cost $500 on ebay.

[JoBy]

I don't really follow you now. As I see the L29 ( that is the Vortech 7400, right? ) is exactly the same as the marine intake you have. We will not use any stock GM ECM. It will be an aftermarket speed density sertup.

 

I have been involved in a few crazy projects before. A few of my friends have similar interests too

 

This is my 1984 Cross-Fire Corvette when it was supercharged ( four year old picture ).

 

After breaking too many th700 I have now installed a 4L80E from a 3500 rwd truck.

 

I am now replacing the supercharger with a turbo and this is a resent picture.

 

 

This is a friend of mine with a 1986 Camaro. He built two superchargers from old turbos and electrucal wheelchair gearboxes. He also installed a 4L80E but it was from a 4x4 truck. He built a new rwd tail housing for that tranny.

 

 

Another friend with a 1987 Camaro when he had the turbo on the stock 350 last summer.

 

 

And this summer when he replaced it with a 454.

 

We all run Speed Density.

[JoBy]

One more question ... Does the upper part of the intake fit the base if you put the throttle on the wrong side? I see that you loose the EGR channel but that is not an isue.

[Larry]

Yes, L29 is the option code name for the 1996-2000 Vortec 7400.

 

Sweet! I bet those cars go like

 

Yes, the upper plenum is symmetrical. It can be flipped around to have the throttle body on either side. The marine units do not use EGR or O2 sensors….it is a non-emissions, open loop speed density system like the GM Performance Parts Ramjet engines. Makes for a cleaner set up I think.