New here and first post so forgive me if I missed this thread and made a duplicate. I have a 1975 L-82 I’ve been working through and recently came into a new intake manifold (Edelbrock 2101) and it lacks an EGR provision. I haven’t installed it due reading that the carb needs recalibration and re-tune. I’ve heard and read of Lars and know he’s the absolute wizard with this but didn’t know how to contact him. Is he still at it rebuilding carbs? If not can somebody steer me in the right direction.

 

Send him an e-mail with your requests. Provide him will all info requested. V8FastCars@msn.com If your carb is original to the car and has not been "butchered" by prior rebuilding efforts, he's more likely to be interested.
As you have heard previously, he is one of the best available to work on your (or any) QuadraJet carb. Be aware that if your engine has vacuum leaks or other ignition/timing problems, rebuilding the carb will not solve those issues. Everything must be in good condition for ALL to work well together.

 

You are obviously a very wise person. Don’t waste your time and money trying to rebuild your Quadrajet, just follow the instructions that Lars provides and send it to him. His work is the absolute best and he takes all the guesswork out of adjusting or monkeying with your carburetor. I had the original intake manifold installed on my small block, so I let a professional mechanic do the work. The mechanic I used, was thoroughly impressed with the carb that Lars restored.

 

Welcome to the Corvette Forum bradysmart! We are glad you have joined us in learning all we can about one of the best Corvette models ever made. This is the place that questions can be answered and knowledge gained! The amount of experience is amazing and it can be yours for the asking!

Pictures of the carburetor might be handy as Lar's is able to see issues just by looking at the Quadrajet bodies. Any open holes or things that appear strange should be pointed out to him. I always get a kick out of a write up of what Lars Sees when looking at a quadrajet versus the un-trained eye. The man is a true "Master of Carburetors" and very, very little gets past him. Many times, Lar's can tell you if the carburetor is rebuild-able or even worth trying to rebuild from the outward appearance of the carburetor and this is where the pictures come in handy for him. That and any numbers found on the body would be useful.

Keeping the EGR operational makes a big difference in some engines. I have a C4 that experienced a EGR failure that cost me a bunch of time and money to fix but the engine runs great with a newly functional EGR working in that C4. Without a functional EGR many cars will experience higher than normal Combustion Chamber Temperatures and this might lead to pinging or detonation in the engine when it is hot. The functional EGR keeps the temperatures cooler inside the combustion chamber and reduces the need for more octane. A ignored or disabled EGR will not help the engine as the EGR is an important component. I prefer to keep the emission systems working to ensure the best performance with cleaner emissions.

It is a good idea to keep the EGR on your 1975 L82 and keep it working.

 

Thanks guys for all the helpful responses, email contact, and advice on the EGR delete or keep. I’ll get pictures of it in the morning and post them as well as shoot Mr. Lars and Email. Gentlemen, I thoroughly appreciate your insights so far. I look forward to getting better at working on this vehicle with y’all and getting better at figuring out how to properly use the forum.

 

This is the main confusing part for me. Forgive my ignorance but I was under the impression that it was the opposite: Having the EGR would actually raise the intake temp and therefore the combustion temperature. If you know the reasoning behind why it actually raises the temperature please enlighten me I’m actually genuinely curious. I assure you as complicated as the explanation might be i will be able to smell what you’re stepping in. Thanks

 

A C4 also has a computer. Your intake doesn't have an EGR provision, so it has already been deleted. That's one less complication. Make sure that you eliminate, or block open, the heat riser, if your new intake also doesn't have an exhaust crossover.

When you send your carb to Lars, let him know what other changes you intend to make from stock. Headers perhaps? He may need to richen the mixture a bit.

Ask for his timing papers, too, and make sure you make the most of your better-than-new carb!

 

Back in the 70's, the first thing we would do is lose the EGR. how it is a Exhaust Gas Recirculation device could in any way reduce combustion chamber temps is beyond me.
My Gen1 SBC has been running very, very well without one for the vast majority of its life.

 

EGR recirculates exhaust into the intake, which lowers available oxygen. With less oxygen, theres less combustion so cooler combustion temps.

 

Gotcha that makes sense

 

the riser has already been disabled in the open position after it failed closed. The 2101 does have an exhaust crossover