Problem resolved now. Thank you for looking and weighing in on this. I am good to go.
Best regards,
David


Full disclosure. I am installing a 1978 350 SBC engine into my 1974 Corvette Convertible project car. It is bored .030 over; has L-82 heads; L-82 intake; and a 350/350 cam in it for a nice spirited sound and feel. I have an engine matched Edelbrock Quadrajet carburetor that Lars tuned to match this setup. That is the background.

I would like to run my stock TI distributor which has been restored and run my stock air cleaner setup on the car. I have two items I need to address.

1) The L-82 aluminum intake (1978) does not have provisions for mounting my coil bracket. My stock iron intake has two mounting locations (threaded raised holes) for mounting this bracket. I either have to find a way to mount the bracket on the intake OR swap the distributor to HEI and lose my fit for the air cleaner box AND have to switch to an electronic tachometer; OR figure out a way to mount my coil to this intake; OR find an intake manifold that will give me similar performance to the L-82 but include the mounting bosses.

2) The L-82 intake has these two openings. I have a cover plate for the opening on the right, solved that one yesterday. The EGR valve opening can either have a plate to shut it off OR I can install the EGR valve that I have for the 1974. Not certain which to do with this one.

So those are my two issues at the moment and any guidance you have from your experience would be welcomed.

Always a risk throwing out items like this but I am certain one or more of you have some helpful thoughts which I can use to make some decisions.

Thanks again for your help.

David Howard
AllVettes4Me

 

In my haste I forgot the pictures. Here they are with descriptions below them. Thank you. David

L-82 intake I have from a 1978.

Boss area that my iron intake has from my 1974.

The two openings I am speaking of in my post.

 

And here is a full picture of my L-48 iron intake from my 1974.


Here are the mounting bosses for the coil bracket.


One day I plan to restore the original L-48 from the car, but not today. I will keep it though as it is the numbers matching engine to my convertible.

 

The fist thing that came to mind is a GM ZZ4 take-off intake manifold. It does have the bosses and is aluminum. Looks nicer than an L-82 intake too.

 

Thank you, I will check into the ZZ4.
David

 

Hi David,

If you get the EGR plate, get it powdercoated. I have a ZZ4 manifold waiting for a swap on my 79 (I'm waiting until I really need it). I used the EGR plate from that manifold on my 79. It's a bit rusty already. I'll have to blast it and powdercoat it someday.

Did you go with an electric choke, and don't need the heat stove?

Also, to not clutter your build thread, I'd absolutely go with an HEI distributor while you're at it. They do exist with both HEI and a mechanical tach drive. I can't vouch for one, but here's a quick example:
https://www.summitracing.com/int/par...001-t/overview

 

 

So let me add insult to injury.
I purchased this Edelbrock 2101 intake manifold to use on my 1974 engine and then decided to wait on restoring that engine.
It is powder coated orange and has a square bore/spread bore feature. It also has the bosses needed to mount the external coil bracket.
Summit racing says it will fit my application and it will fit my current air cleaner setup.
What do you folks think?

 

It is the non EGR intake.

 

And I have the option to purchase this ZZ4 intake as well for a very reasonable price. $65 and it too can be GM orange powder coated and you guessed it, spread bore/square bore compatible.
What say you folks?

 

Will your hybrid L82 have high enough compression to work Well with a 350/350 cam's duration ?

EGR plate ... Choke Stove plate ... new ones on fleabay ... aluminum or chrome ... about $10 -15 delivered.

You might mount coil remotely on firewall ... they typically perform better/longer when separated from heat & vibration.

 

Install the 2101

 

And forget about the EGR then I am guessing. It has the choke spring mounting area for the quadrajet choke. My picture shows it covered but it is there.

 

The coil mounting locations are important...but so is the mounting for the choke coil. Adding a tapped hole and a [removable] boss at the correct location for the other coil mount is no big deal. But you need to address BOTH of those issues if you are to be successful. So use any suitable intake you have that will resolve both of those issues.

Good luck

 

Bolt that 2101 Performer on.......that would be ideal. The L-82 intake is a woeful low rise piece with crummy runners......just about any aftermarket intake works better.
Block the heat riser off with a 1204 Fel-Pro intake gasket. Run the thick 1/4" Q-Jet spacer gasket from Quadrajet parts.
I am pretty sure that the EGR Performer IS the ZZ4 intake.....I am almost positive it is cast by Edelbrock.......look at the similarity between the two you have....also look at the night and day difference between the L-82 intake and the Performer.......
The 350/350 cam is so close to the facotry L-82 cam that I doubt anyone would be able to tell the difference....the 350/350 cam being a touch larger.
Curve that TI distributor and set total timing for 36 degrees and Vacuum can per Lars papers......and then finish it off with a set of quality long tube headers. Do these things and that engine will surprise the hell out of you.

Jebby

 

Thank you Jebby. My 1903 carb has a hot air choke so I went to Summit Racing and ordered the hot air to electric choke coversion kit and will be installing it on the 1903 carburetor. I also ordered the Fel-Pro 1204 intake gasket. Those will get here in a few days.

I do see what you mean about the ZZ4 and performer 2101, almost identical. I will stick with the 2101 then. I'll convert to electric choke; eliminate the EGR, move forward with the car. Thank you sir.

Next time I get down to New Braunfels I owe you a dinner. You coming up to Carlisle end of the month?

David Howard

 

The ZZ4 intake is a better unit; Chevrolet swears it makes the same power/same basic torque curve as the old LT1 manifold. Only potential issue is height - its shorter than a real LT1 / Z28 intake, but taller than your stock L82 by over an inch. May hafta use an aftermarket or earlier open element air cleaner assy from a 68 to 72 car. Personally have used an LT1 intake, L46 cam and Holley on 9 to 1 motors in the past more than once - about my personal favourite combo for a no muss no fuss crappy gas street motor. Have a ZZ4 sitting in a box waiting to go on an L82...
Block off the egr and use the heat riser crossover with the little plates that FelPro supplies with their best intakes unless you live in a cold climate and drive it every single day. Headers and a Pypes exhaust system will make a very nice powertrain.
Oh...you didnt ask me, but I'll chime in anyway - stay away from the edelbrock carb. use either a well built Q-jet or a Holley; personally really like a 6210 spreadbore iof you want mechanical secondaries and the 08555 looks about best for a spreadbore 650 vacuum secondary unit. Persoanlly like spreadbores on the street, but if you want a square bore, I would recommend any number of Holleys whose numbers I dont remember. Keep it around 600 to 650 cfm unless you spennd a lot of time above 3500-4000 rpm.
Just my opinion and worth what it costs you.