Edelbrock LT4 VS Stock LT1 Intake pics
#1
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Received my Edelbrock LT4 intake about 3 days ago and decided to do a little photo shot with the stock LT1 intake. Not going to stay stock for long plan on sending it to Lloyd in the next week or two to get fully ported and opened my Monoblade with a Nitro Dave's Monoblade nitrous plate (only 5 in existance so far, lol) Should move some air.
BTW I did not weigh the manifolds but they have to be within a pound of each others so we should see similiar weight with a ported Edebrock and stock casting.
![](http://i69.photobucket.com/albums/i77/TAKID/benparts071.jpg)
As you can see from the Front view of the intake the Edelbrock version utilizes a 58mm TB bores vs the stock 48mm TB bores. Also notice the thicker mating surface where the intake mates with the heads and the block.
![](http://i69.photobucket.com/albums/i77/TAKID/benparts072.jpg)
![](http://i69.photobucket.com/albums/i77/TAKID/benparts073.jpg)
Something I found interesting is there is a port in the back of the intake that is not apparent on the stock castings??? Maybe someone knows what it is for, because I am kinda of clueless?
![](http://i69.photobucket.com/albums/i77/TAKID/benparts074.jpg)
Edebrock places the casting number on the passenger side EGR selonoid on the back of the intake and from what I can tell stock style block off plates will work fine.
![](http://i69.photobucket.com/albums/i77/TAKID/benparts075.jpg)
From what I can tell the Edelbrock intake seems to be between a half an inch to an inch in width, and the LT1 intake runners measure roughly 3inches vs the Edlebrock’s 3.25(I believe the Miniram intake has a 3.5 inch runner which looks a lot like the Edelbrock intakes.
![](http://i69.photobucket.com/albums/i77/TAKID/benparts078.jpg)
![](http://i69.photobucket.com/albums/i77/TAKID/benparts084.jpg)
In these pics you can actually see the way the intake is shaped in the back and along the intake by the tops fins
![](http://i69.photobucket.com/albums/i77/TAKID/benparts079.jpg)
![](http://i69.photobucket.com/albums/i77/TAKID/benparts080.jpg)
![](http://i69.photobucket.com/albums/i77/TAKID/benparts081.jpg)
![](http://i69.photobucket.com/albums/i77/TAKID/benparts082.jpg)
As you can see the vacuum ports on the driver side are for the PCV, EGR Solenoid, Optispark, and Brake Booster. On the Edelbrock version of the intake the Optispark and the Brake Booster switch locations but can easily be identified since the Brake booster uses a larger vacuum fitting.
The passenger side still uses the FPR vacuum line and the A/C heater control system in the stock locations.
![](http://i69.photobucket.com/albums/i77/TAKID/benparts083.jpg)
![](http://i69.photobucket.com/albums/i77/TAKID/benparts086.jpg)
Another plus for this manifold is that it accepts the GM LT4 Race gasket part number 12367777 the factory intakes must be ported to accept that.
![](http://i69.photobucket.com/albums/i77/TAKID/benparts087.jpg)
BTW I did not weigh the manifolds but they have to be within a pound of each others so we should see similiar weight with a ported Edebrock and stock casting.
![](http://i69.photobucket.com/albums/i77/TAKID/benparts071.jpg)
As you can see from the Front view of the intake the Edelbrock version utilizes a 58mm TB bores vs the stock 48mm TB bores. Also notice the thicker mating surface where the intake mates with the heads and the block.
![](http://i69.photobucket.com/albums/i77/TAKID/benparts072.jpg)
![](http://i69.photobucket.com/albums/i77/TAKID/benparts073.jpg)
Something I found interesting is there is a port in the back of the intake that is not apparent on the stock castings??? Maybe someone knows what it is for, because I am kinda of clueless?
![](http://i69.photobucket.com/albums/i77/TAKID/benparts074.jpg)
Edebrock places the casting number on the passenger side EGR selonoid on the back of the intake and from what I can tell stock style block off plates will work fine.
![](http://i69.photobucket.com/albums/i77/TAKID/benparts075.jpg)
From what I can tell the Edelbrock intake seems to be between a half an inch to an inch in width, and the LT1 intake runners measure roughly 3inches vs the Edlebrock’s 3.25(I believe the Miniram intake has a 3.5 inch runner which looks a lot like the Edelbrock intakes.
![](http://i69.photobucket.com/albums/i77/TAKID/benparts078.jpg)
![](http://i69.photobucket.com/albums/i77/TAKID/benparts084.jpg)
In these pics you can actually see the way the intake is shaped in the back and along the intake by the tops fins
![](http://i69.photobucket.com/albums/i77/TAKID/benparts079.jpg)
![](http://i69.photobucket.com/albums/i77/TAKID/benparts080.jpg)
![](http://i69.photobucket.com/albums/i77/TAKID/benparts081.jpg)
![](http://i69.photobucket.com/albums/i77/TAKID/benparts082.jpg)
As you can see the vacuum ports on the driver side are for the PCV, EGR Solenoid, Optispark, and Brake Booster. On the Edelbrock version of the intake the Optispark and the Brake Booster switch locations but can easily be identified since the Brake booster uses a larger vacuum fitting.
The passenger side still uses the FPR vacuum line and the A/C heater control system in the stock locations.
![](http://i69.photobucket.com/albums/i77/TAKID/benparts083.jpg)
![](http://i69.photobucket.com/albums/i77/TAKID/benparts086.jpg)
Another plus for this manifold is that it accepts the GM LT4 Race gasket part number 12367777 the factory intakes must be ported to accept that.
![](http://i69.photobucket.com/albums/i77/TAKID/benparts087.jpg)
![](http://i69.photobucket.com/albums/i77/TAKID/benparts088.jpg)
Last edited by T/A KID; 05-11-2007 at 08:53 PM.
#5
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Originally Posted by Beaflag VonRathburg
Interesting pictures. It seems like a viable alternative to the LT4 intake. Stock vs this intake dyno numbers would be interesting with the intake being the only thing changed.
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Camera flash is your friend
Those rear shots are hard to see what you're talking about. Especially the width one. Looks the same to me.
Anyways it looks nice. Am I correct in assuming these are "backwards compatible" with 93 motors?
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Anyways it looks nice. Am I correct in assuming these are "backwards compatible" with 93 motors?
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Looks really nice, and it looks like it has a lot more meat on it where it meets the heads. That could be huge for the guys trying to mount the Arao 32V heads.
Can you explain the last picture to me. Is that a chop? why does it look so much smaller all of the sudden???
Can you explain the last picture to me. Is that a chop? why does it look so much smaller all of the sudden???
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Originally Posted by Stroker396
Can you explain the last picture to me. Is that a chop? why does it look so much smaller all of the sudden???
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heh Just so you know T/A KID, that's the "LT1" version of the Edel. 7109 is the "LT4" version. It says they're matched to their appropriate heads, but if there's really a difference between them I have no idea. Second paragraph, starting with DESCRIPTION is where it talks about all that.
http://www.edelbrock.com/automotive_.../7000/7107.pdf
http://www.edelbrock.com/automotive_.../7000/7109.pdf
http://www.edelbrock.com/automotive_.../7000/7107.pdf
http://www.edelbrock.com/automotive_.../7000/7109.pdf
#19
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The "mystery port" on the back is for EGR passage machining
Camera flash is your friend Those rear shots are hard to see what you're talking about. Especially the width one. Looks the same to me.
Looks really nice, and it looks like it has a lot more meat on it where it meets the heads
![Happy](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_stretch.gif)
your sending the edelbrock to lloyd, i cant wait, he was worried when i talked to hmi about it, about plenum volume...id love to see if he can flow this thing stock and then port it and see aht it does vs the lt1 and lt4 manifolds
heh Just so you know T/A KID, that's the "LT1" version of the Edel. 7109 is the "LT4" version