Can anyone please tell me what this small plate is on the back of my 3800 Series 3 SC Intake Manifold? I have been chasing a vacuum leak in this area (using a smoke machine) thinking it was the SC gasket but now wondering if the problem is with this plate with a small gap into the intake. Could this be my vac leak? Does show blow by marks. Also, this is a crate motor (I purchased from Chevy Dealership in ’07 and installed in my ’87 GT) so I would think it came from the factory like this as that plate is tightly secured with sealant in that position on the intake. Thanks!

quote Originally posted by Bushwacker87: Can anyone please tell me what this small plate is on the back of my 3800 Series 3 SC Intake Manifold? I have been chasing a vacuum leak in this area (using a smoke machine) thinking it was the SC gasket but now wondering if the problem is with this plate with a small gap into the intake. Could this be my vac leak? Does show blow by marks. Also, this is a crate motor (I purchased from Chevy Dealership in ’07 and installed in my ’87 GT) so I would think it came from the factory like this as that plate is tightly secured with sealant in that position on the intake. Thanks!

that's an egr block off plate.....they sent it to you with that?

No, now remember shop that installed my motor deleted the EGR valve. Obviously they didn't do a very good job but easy to fix. Thanks for your info!

quote Originally posted by Bushwacker87: No, now remember shop that installed my motor deleted the EGR valve. Obviously they didn't do a very good job but easy to fix. Thanks for your info!

your welcome. it was a 5 seconds google search since i had a series 2 sc i hated and removed where the egr was placed (factory block off because gtp and imported)

quote Originally posted by cartercarbaficionado: that's an egr block off plate.....they sent it to you with that?

This is the way the EGR passageway to the manifold is usually blocked.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

Thanks so much Guys!