Late Model Engine Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

buildinga55 · 07-30-2009, 10:55 PM

I converted an 88 350 from TBI to Carburation. There are several sensors or sending units on the engine that I should not need. I am not sure what all of them are for, there is one behind the starter in the block that is in the way of my headers, there is one above the oil filter, maybe a low oil or change oil soon sensor??? Is it ok to plug these holes? I was going to put the old style oil pressure switch behind the distributor and take out the one that was in the TBI. Does this all sound ok. I appreciate your comments. Thanks

Colin B · 07-30-2009, 11:04 PM

The one above your starter is the knock sensor, most of them are just for the computer, so you won't need them anymore.

MrSinister · 07-30-2009, 11:06 PM

the sensor above the oil filter is the oil pressure switch for the stock fuel pump and is not needed the other one is the knock sensor and again not needed for carb

MrSinister · 07-30-2009, 11:07 PM

BTW i have an 87 tpi 350 converted to carb in my truck

buildinga55 · 07-30-2009, 11:08 PM

I have not removed them yet, you happen to know what size thread they are so I can get some plugs, or maybe they are SAE bolt treads???

MrSinister · 07-31-2009, 01:25 AM

I haven't taken mine out but chevy liked to use npt fittings

buildinga55 · 07-31-2009, 11:57 PM

I changed mine tonight, just to let you know, they are 1/4 NPT.

**mr48chev** · 08-01-2009, 02:17 PM

I think the knock sensor just deadheads into the block and may not have to be plugged.

07-30-2009, 10:55 PM	#1
buildinga55 Registered User Join Date: Jan 2009 Location: Springfield, MO Posts: 258	Late Model Engine Question I converted an 88 350 from TBI to Carburation. There are several sensors or sending units on the engine that I should not need. I am not sure what all of them are for, there is one behind the starter in the block that is in the way of my headers, there is one above the oil filter, maybe a low oil or change oil soon sensor??? Is it ok to plug these holes? I was going to put the old style oil pressure switch behind the distributor and take out the one that was in the TBI. Does this all sound ok. I appreciate your comments. Thanks

07-30-2009, 11:04 PM	#2
Colin B Registered User Join Date: Nov 2008 Location: Denham Springs, LA Posts: 29	Re: Late Model Engine Question The one above your starter is the knock sensor, most of them are just for the computer, so you won't need them anymore. __________________ 1990 Chevy Silverado 1951 -Chevy Suburban in pieces

07-30-2009, 11:06 PM	#3
MrSinister Registered User Join Date: Mar 2007 Location: Everett Wa Posts: 70	Re: Late Model Engine Question the sensor above the oil filter is the oil pressure switch for the stock fuel pump and is not needed the other one is the knock sensor and again not needed for carb __________________ '56 Big window 350/700r4 9" rear w/disc

07-30-2009, 11:07 PM	#4
MrSinister Registered User Join Date: Mar 2007 Location: Everett Wa Posts: 70	Re: Late Model Engine Question BTW i have an 87 tpi 350 converted to carb in my truck __________________ '56 Big window 350/700r4 9" rear w/disc

07-30-2009, 11:08 PM	#5
buildinga55 Registered User Join Date: Jan 2009 Location: Springfield, MO Posts: 258	Re: Late Model Engine Question I have not removed them yet, you happen to know what size thread they are so I can get some plugs, or maybe they are SAE bolt treads???

07-31-2009, 01:25 AM	#6
MrSinister Registered User Join Date: Mar 2007 Location: Everett Wa Posts: 70	Re: Late Model Engine Question I haven't taken mine out but chevy liked to use npt fittings __________________ '56 Big window 350/700r4 9" rear w/disc

07-31-2009, 11:57 PM	#7
buildinga55 Registered User Join Date: Jan 2009 Location: Springfield, MO Posts: 258	Re: Late Model Engine Question I changed mine tonight, just to let you know, they are 1/4 NPT.

08-01-2009, 02:17 PM	#8
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,711	Re: Late Model Engine Question I think the knock sensor just deadheads into the block and may not have to be plugged.



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