EGR valve block off plate search

[eslusser]

Anyone know where I can purchase a 302 EGR valve block off plate for a 77? I see a lot,of them for 80s-90s fords but can’t find one for the older Broncos. Need to remove the EGR valve and a block off plate is easier than a new carb spacer.

 

[jckkys]

True nobody made them. I would take a 3 1/2" long 1" wide piece of steel strapping 1/4" thick if you can find it and drill 2 holes in it 2 7/8" apart on centers. One hole needs to be 3/8" and the other 5/16" diameter. That's your block off plate.

 

[Mark1911]

I wonder if an EGR block off plate for a later injected 5.0l would have the same footprint? Like say a 1992 Mustang

Mark

 

[jckkys]

No, the '80s-'90s EGR valve mounting surface is larger, taller, and wider and the bolts are further apart.

 

[Ovalis]

I wish I could tell you where I found mine, but I think I found it in a box of parts, but my point is that my block off plate is a fairly thin plate of stainless that is sandwiched between the manifold and the carb spacer. So my EGR is still mounted to the spacer, but no exhaust flows to it.

 

[jckkys]

The '75-'77 intake had a large elongated EGR hole in the carb mounting surface that most gaskets and plates won't seal. The '73/'74 intake had a smaller round hole that is easily covered. The '77 EGR spacer has round hole in the back that could be sealed with a pipe plug. My '77 EGR was a real PITA to delete. A 351 with a '69 Mustang 4 bbl intake was the solution. A '68 frame and title made it legal.

 

[blubuckaroo]

Just use a piece of stainless shim stock on the EGR valve side of the gasket, and put the valve back on.
Getting the engine to run right after disabling the EGR is another thing though.

You may be happier with the EGR working though. Although some will tell you that the reason for EGR is to reburn exhaust, that's not true.
The reason for adding metered exhaust gas to the mixture is to slow combustion, reducing hydrocarbons. Disabling it usually causes pinging. The normal response to pinging is to retard the timing. You end up with a poopy motor.

The carburetor jetting and cam timing are designed for use with EGR.

 

[EPB72]

Just use a piece of stainless shim stock on the EGR valve side of the gasket, and put the valve back on.
Getting the engine to run right after disabling the EGR is another thing though.

You may be happier with the EGR working though. Although some will tell you that the reason for EGR is to reburn exhaust, that's not true.
The reason for adding metered exhaust gas to the mixture is to slow combustion, reducing hydrocarbons. Disabling it usually causes pinging. The normal response to pinging is to retard the timing. You end up with a poopy motor.

The carburetor jetting and cam timing are designed for use with EGR.

Hey Blu your 95% correct but EGR is used to reduce NOx BY added metered exhaust gases to combustion the inert gas acts as an absorbent of heat to reduce the peak in cylinder temperature ..and yes other changes tuning maybe required .....I'll add that higher compression pressures also increase NOx gasses substantially..

 

[blubuckaroo]

Hey Blu your 95% correct but EGR is used to reduce NOx BY added metered exhaust gases to combustion the inert gas acts as an absorbent of heat to reduce the peak in cylinder temperature ..and yes other changes tuning maybe required .....I'll add that higher compression pressures also increase NOx gasses substantially..

I had my smog license back in the early '70s. So many would hack their emissions systems, thinking it all caused poor performance.
I've seen people disable the heated intake air, and PCV thinking it was just more smog junk.
The one thing you can disconnect without messing up the performance is the Thermactor air injection. That IS junk.

 

[jckkys]

Ford retarded the cam timing 4 degrees in '72 and EGR was introduced in '73. Tho this was clearly done for other reasons, the low end torque and MPGs were hurt and later changes didn't make things better. My '68 289 had far better response, drive abillity, and MPGs than either my '74 or '77 302s. Everybody living through those years and bought a vehicle saw this. It's no surprise the average owner saw emissions equipment as the culprit. They did go overboard by trashing everything. I don't blame them. I blame the worthless parasitic bureaucrats and the car makers for not honestly telling us exactly what they did and why. What we did know was that vehicles drove worse, were more expensive, got less MPGs/HP, and needed more maintenance. Congratulations to CARB aka the California Air Research Board for screwing things up. I don't want to hear their propaganda again now.