Resolved 1G What is this hole on the intake side of the head

RLSchwabe · Feb 27, 2023

Can anyone tell me what the hole circled in red is for? Someone filled it with silicone. It's a 91' 6-bolt. I've searched the forums but couldn't come up with an answer. Thank you.

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Newfie2004 · Feb 27, 2023

RLSchwabe said:
Can anyone tell me what the hole circled in red is for?

I think it is for the EGR. Not 100% sure, though

fwdmaster · Feb 27, 2023

Newfie2004 said:
I think it is for the EGR. Not 100% sure, though

That’s correct.

DSMPT · Feb 27, 2023

EGR port. If you want to block off there, remove that silicone and tap for a 1/8" or 1/4" plug to block off. If you let that port open and block off the EGR valve on the stock intake manifold, use a OEM or aftermarket metal intake manifold gasket. Shouldn't use a paper or thermal intake manifold gasket if you let the port on head side open.
Search with Head EGR Port Block Off. You will find many info.

RLSchwabe · Feb 27, 2023

Thank you so much guys!

Reference: https://www.dsmtuners.com/threads/egr-block-off-plug-size.421180/

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Resolved 1G What is this hole on the intake side of the head

RLSchwabe

Newfie2004

Newfie2004

fwdmaster

DSMPT

RLSchwabe

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