Swap S upper for F & leave the S lower?

[Crankme69]

I'm picking up the EGR mystery gasket tomorrow am. I have a replacement F upper & lower intake to install. I have been reading & looking at pics, it would appear I can get the majority of the benefit by using the upper F and pounding the freeze plug with gasket into the existing S lower intake?

I can bolt the F upper to my S lower intake right?

I have already eliminated the EGR issues with a replacement custom chip, so that won't be an issue...

Oh & buy the way...the truck is running awesome just looking to help it breath a little better

TIA

 

[Matt Bachand]

Yes they will bolt right up. But if you have the F, why not just toss it in?

 

[buddy]

I like your new Avatar, the wheels look good.

Attached are pics of the EGR intake. I think changing the upper is only about 70% of the benefit.

No EGR gasket with no EGR on the upper plenum. freeze plug seals what you would have been keeping out of the intake with that gasket.

The F intake has none of that stuff, just wide open space.

 

[Crankme69]

Thanks for the compliment Buddy!

I'm just a tad concerned about doing the lower until I do injectors. The mystery gasket can...can that be used with the freeze plug somehow to assure a tight seal? Like wrap it around it before I hammer it in?

 

[Paveltolz]

The inside of my old upper and lower looked worse than Buddy's and everyone else that runs an EGER "S" set up.

This is what mine looked like after 10K miles with the "F" upper and lower swap. Unbelievable.:thumbsup:

Do yourself the favor since you have both the upper and lowers...10 or so bolts, clean some ground connections to the new lower while you're there, torque em down and have done with it.

 

[buddy]

The new F intake I bought on ebay didnt even have the little cylinder on the upper plenum, and it was smooth topped, no protruding shape of the EGR valve on top.

I think people that dont change the upper intake and only freeze plug the top part still need the mystery gasket to seal between lower and upper EGR tower/pillar.

If you freeze plug the lower plenum then exhaust gases cannot get into the intake at all.

 

[Paveltolz]

The new F intake I bought on ebay didnt even have the little cylinder on the upper plenum, and it was smooth topped, no protruding shape of the EGR valve on top.

Yeah, that's a small wonder of GM production but it is what it is and I got the whole set up for $100. Some have said to remove the cylinder, other's have said to leave it. I can't see it making that much difference.

I think people that dont change the upper intake and only freeze plug the top part still need the mystery gasket to seal between lower and upper EGR tower/pillar.

If you freeze plug the lower plenum then exhaust gases cannot get into the intake at all.

I did some searching and came across this one from Turbine Doc on and earlier thread. http://www.thetruckstop.us/forum/showthread.php?t=19929&highlight=mystery+gasket&page=2

...freeze plug is one way of capping off EGR inside the plenum, another way is to put in new "mystery gasket" which is a 1 time use gasket labeled in some catalogs "GASKET-EGR VLV P" The ACDelco part # is 219-167 The GM part # is 10191428

Then put a .050" shim between the base of the EGR valve, and upper intake, which will block flow of EGR and still allow the vacuum system to cycle the actuator on the EGR valve so you don't code a EGR code.

FWIW, as an admitted diesel retard, I've replaced three sets of injectors and never once had to remove the lower intake...fender wells and turbo maybe for ease of access on the passenger side, but never the lower intake. Be brave, you've obviously got skills, so go for it. The gaskets between the lower intake and heads will take it.:thumbsup:

 

[Crankme69]

Yea I am gonna look at it more tomorrow after I pull the upper, it might happen, I have the gaskets here to do the lower...

Thanks for the link & sharing the info!

 

[Paveltolz]

Its what everyone does here. Have fun and post back whatever path you choose.

 

[Crankme69]

Ok it's done upper & lower. Too much chit in there to just do the upper.

That friggin quick connect on the heater hose is gone also, what where they thinking with that...?

 

[buddy]

Good work...

Let us know if it feels any better, or you notice any more engine noise.

 

[Crankme69]

Will do, it's not left the driveway yet...