454 Vortec EGR Pipe Cap Sizes?

[Supercharged111]

Anyone know the size cap needed to plug the EGR hose coming off the driver's side manifold to intake manifold? With the transmission in the truck it looks about impossible to get that damn hose back on.

 

[L29Sub]

If capping the EGR, you'll require a 'tune' that deletes the EGR function and retunes the engine for sans EGR. The EGR function is complicated and shutting it off might set off the knock sensors. It'll definitely set codes and create an emissions fail. If tested. It'll fail a visual.

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[Supercharged111]

I tuned it out long ago.

 

[L29Sub]

Cut one of the nuts off the EGR tube and drop a plug in and tighten it down. Something like a metal handybox knockout would fit...I think. You get the idea.

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[Supercharged111]

Yeah, that also got me thinking about tapping the ID of the male fitting to crank a pipe plug into it.

 

[Supercharged111]

Depending on how all that fits, I could cram a nut with a knockout down on top of all that.

 

[Schurkey]

This one?

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https://www.summitracing.com/parts/nal-12556596

 

[Supercharged111]

Does it fit a 454? Nobody specifies in the reviews what their vehicle is. If this guy is right, then this is a winner right here.

So, I just removed it and replaced it with a fully threaded steel plug with 1/2" pipe thread, slathered in pipe dope, and that works great, sitting flush, with many threads of engagement. Save your money and just make a trip to the plumbing section of your local hardware store.

 

[Schurkey]

Wild Guess: Doesn't matter if it's small-block or big-block, the EGR pipes on Vortecs are all threaded the same.

The problem with the cheap "Pipe thread" solution is that you're going to destroy the existing threads by forcing an improper fitting into place.

What you're dealing with is almost certainly NOT pipe thread.

I'd expect an inverted-flare, straight thread, and perhaps metric.

 

[Supercharged111]

My thought was if the thread count is the same between that and the pipe plug it shouldn't be a bad option. Guess I gotta google what that is.