EGR Valve: Keep or Remove?

[theblindchicken]

74 sbc 350 0.030" over with a hyd. tappet 12-238-2 comp cam, 76cc 882 heads (1.94/1.5 and 1.5 rockers), -3.5cc domed pistons factory intake manifold w/ 4bbl quadrajet.

Edited engine specs for more accurate. I'm planning on going to 10:1 or 10.5:1 at a later date as well.

Is it more beneficial to keep the EGR valve or to remove and block it off?

 

[PrairieDrifter]

I don’t see any benefit have having it unless your in an emissions state. I’d say remove it and block it off. Others might have a different opinion

 

[1987 GMC Jimmy]

I'd say leave it alone for the time being if it's working, but if you ever want to get a new intake, get an Edelbrock 2101 that has no provision for an EGR valve, and you can get rid of it then. Getting rid of it won't increase your performance, can increase combustion temperature at certain operating ranges, will slightly increase emissions, and will clean up your intake a little so I'd say it's pretty negligible either way. If it were me, I'd keep it on an ECM vehicle, but I'd get rid of it in the spirit of trimming emissions garbage on anything older.

 

[theblindchicken]

Truck's a 74 in CA, so i'm smog exempt. I read a little on another forum that it helps the engine warm up in the winter, but I thought that was the job of the exhaust crossover, not the recirculating valve?

 

[1987 GMC Jimmy]

The EGR does nothing when you’re idling the truck in a snowdrift. What’re ideally helping to warm things up, if it’s so equipped, are the heat riser tube coming off the manifold stove and going into the the Thermac and the EFE in addition to exhaust crossover. One goal of the EGR is to reduce combustion temps, but I don’t see how it could warm things up except maybe if you got going while the engine was still ice cold, which is a no-no on a carbureted engine anyway.

 

[Rusty Nail]

I doubt you will note any difference with that engine, in that climate, in that truck.

Different story for a high compression , computer controlled , LT-1 that runs in NW Ohio.
Is that what you're talkin about?

 

[theblindchicken]

I'd like to be able to take my truck on up to the mountains during the winter and not have any issues with her warming up.

I'm swapping to headers, so i'm gonna lose that heat riser unless I find a new way to stick it on there.

 

[1987 GMC Jimmy]

I'd like to be able to take my truck on up to the mountains during the winter and not have any issues with her warming up.

I'm swapping to headers, so i'm gonna lose that heat riser unless I find a new way to stick it on there.

One of our really knowledgeable members ran an Air Gap intake, used the factory Thermac, and made a heat stove for the air cleaner.

http://forum.73-87chevytrucks.com/smforum/index.php?topic=27239.0

 

[Craig 85]

Edelbrock used to make a kit, but its no longer in their catalog. #65900 Easy to make though, just clamps to the header primary tube.

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