Help id some spots on a 1991 350 engine - The 1947 - Present Chevrolet & GMC Truck Message Board Network

63 Chevy Stepside · 03-11-2012, 10:22 PM

Hi Guys,
I need some more help. I didn't take this engine apart and my manual is lacking a little. I have a port on each side of the engine that I would like to check out what they are for sure. A small one on the drivers side which I think was just plugged and one one the passenger side that I am not sure what it is. What do you think?

Rooster's 67 · 03-11-2012, 10:54 PM

If memory serves, drivers side is a plug that goes into the coolant passage but was also used for Knock sensor in later years, put in a plug, or drain cock to allow full draining of cooling system. Passenger side is coolant passage also, usually has pipe plug in it.

**rideblue00** · 03-11-2012, 11:46 PM

yes, what rooster said. except i will add the one in the cylinder head is usually for a coolant temp sensor, but on the driver side. pass side can be plugged. should be a standard pipe plug.

63 Chevy Stepside · 03-12-2012, 05:33 PM

Thanks guys, the temp sensory on this engine is up on top right by the thermostat, so I will just plug them both and move on

I appreciate it.

dragginmetal · 03-12-2012, 06:48 PM

The temp sensor on the top by the thermostat, is for the ECU. The hole on the driver side head is for, a temp sensor for the gauge. The one on the passenger side gets plugged.

63 Chevy Stepside · 03-12-2012, 07:36 PM

That's why I love this board, Thanks. I will check into a new switch and see if I can hook it up to the 63 gauge.

Rick

03-11-2012, 10:22 PM	#1
63 Chevy Stepside Registered User Join Date: May 2011 Location: Omaha, NE Posts: 76	Help id some spots on a 1991 350 engine Hi Guys, I need some more help. I didn't take this engine apart and my manual is lacking a little. I have a port on each side of the engine that I would like to check out what they are for sure. A small one on the drivers side which I think was just plugged and one one the passenger side that I am not sure what it is. What do you think? Attached Images

03-11-2012, 10:54 PM	#2
Rooster's 67 Registered User Join Date: Sep 2003 Location: DFW Posts: 765	Re: Help id some spots on a 1991 350 engine If memory serves, drivers side is a plug that goes into the coolant passage but was also used for Knock sensor in later years, put in a plug, or drain cock to allow full draining of cooling system. Passenger side is coolant passage also, usually has pipe plug in it. __________________ The problem with America is stupidity. I'm not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?

03-11-2012, 11:46 PM	#3
rideblue00 Senior Member Join Date: Feb 2010 Location: Lambertville, MI Posts: 1,865	Re: Help id some spots on a 1991 350 engine yes, what rooster said. except i will add the one in the cylinder head is usually for a coolant temp sensor, but on the driver side. pass side can be plugged. should be a standard pipe plug.

03-12-2012, 05:33 PM	#4
63 Chevy Stepside Registered User Join Date: May 2011 Location: Omaha, NE Posts: 76	Re: Help id some spots on a 1991 350 engine Thanks guys, the temp sensory on this engine is up on top right by the thermostat, so I will just plug them both and move on I appreciate it.

03-12-2012, 06:48 PM	#5
dragginmetal here, just not logged in Join Date: Nov 2007 Location: Tx Posts: 1,011	Re: Help id some spots on a 1991 350 engine The temp sensor on the top by the thermostat, is for the ECU. The hole on the driver side head is for, a temp sensor for the gauge. The one on the passenger side gets plugged. __________________ Mike 88 GMC "GOT BORED" several truck pics a few '88-'98 pics more pics

03-12-2012, 07:36 PM	#6
63 Chevy Stepside Registered User Join Date: May 2011 Location: Omaha, NE Posts: 76	Re: Help id some spots on a 1991 350 engine That's why I love this board, Thanks. I will check into a new switch and see if I can hook it up to the 63 gauge. Rick

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