Temperature sender on new style motor ??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BubbaGreen · 06-08-2005, 06:00 PM

For all you guys that have installed later model engines SBC-350, the temperature sending ports on the newer heads are smaller. What sending units work with new style heads and the original type gauge. THANKS!!!

**pjmoreland** · 06-08-2005, 07:14 PM

I have seen this question asked several times, and have yet to see an answer. For my truck I found a water neck (thermostat housing) from an early '80s car that had the right size threaded hole in the top of it for the temperature sender. It's not the ideal location for the sender, but it works.

724wdcopper · 06-09-2005, 12:55 PM

i asked this question a month or two ago, like said, not much in the way of answers. best bet is to drill out manifold and mount temp sender there.

PMS · 06-09-2005, 02:03 PM

I used an aftermarket GM intake and it had the correct size hole by the thermostat housing. I just re-located wiring to new location.

BubbaGreen · 06-09-2005, 02:25 PM

I have decided to just use an open fitting near the thermostat...will use the drivers side manifold for the temp-light. If I come up with anything else, I will post it...

tomatocity · 06-09-2005, 02:35 PM

Quote:

Originally Posted by BubbaGreen

For all you guys that have installed later model engines SBC-350, the temperature sending ports on the newer heads are smaller. What sending units work with new style heads and the original type gauge. THANKS!!!

If you can find out the voltage output range for each of these senders you could possibly add an inline resistor to get the gauge to read properly. Do the Haynes manuals cover this information?

**pjmoreland** · 06-09-2005, 02:43 PM

If I remember correctly, the newer smaller senders have higher resistance than the older larger senders, so adding a resistor inline with a newer sender will make the situation worse. It might be possible to connect a resistor between the terminal of the sender and ground to lower the resistance, but we would need to know the specs of the new and old sensors in order to size the resistor correctly.

687980chevy · 06-13-2005, 02:27 AM

687980chevy · 06-13-2005, 02:29 AM

A guy I know put a set of vortec's on. He drilled and tapped the driver side head (before head was on). I told him I'd be afraid to do that. He said it went real smooth.But he did say he was nervous drilling and tapping a brand new head!

72c5 · 06-13-2005, 10:35 AM

I bought a new t-stat housing and sender from LMC...........the sender would not fit any of the holes in the Edlebrock RPM manifold or the vortec heads...........I actually had to try a couple housings, one would not match up w/ the rad hose correctly.

adkphoto · 06-13-2005, 03:27 PM

I plugged the hole on my Vortec heads and mounted the temp sensor at the thermostat housing... works like a charm, inexpensive, and has 0 chance of screwing up your heads.

D

06-08-2005, 06:00 PM	#1
BubbaGreen Senior Member Join Date: Mar 2001 Location: Cedar Park, TX Posts: 686	Temperature sender on new style motor ??? For all you guys that have installed later model engines SBC-350, the temperature sending ports on the newer heads are smaller. What sending units work with new style heads and the original type gauge. THANKS!!! __________________ 71 Chevy C-10 SWB Fleetside RamJet-350/4L60e & Compushift/3.73Posi See it at www.prismnet.com/~grzanich

06-09-2005, 02:25 PM	#5
BubbaGreen Senior Member Join Date: Mar 2001 Location: Cedar Park, TX Posts: 686	I have decided to just use an open fitting near the thermostat...will use the drivers side manifold for the temp-light. If I come up with anything else, I will post it... __________________ 71 Chevy C-10 SWB Fleetside RamJet-350/4L60e & Compushift/3.73Posi See it at www.prismnet.com/~grzanich

06-13-2005, 02:27 AM	#8
687980chevy Registered User Join Date: Feb 2004 Location: Hilly Southern Indiana! Posts: 201	Next post __________________ 68 K-10,79 K-10,80 C-30 57 chevy convertible 79 Z28 Last edited by 687980chevy; 06-13-2005 at 02:32 AM.

06-13-2005, 02:29 AM	#9
687980chevy Registered User Join Date: Feb 2004 Location: Hilly Southern Indiana! Posts: 201	A guy I know put a set of vortec's on. He drilled and tapped the driver side head (before head was on). I told him I'd be afraid to do that. He said it went real smooth.But he did say he was nervous drilling and tapping a brand new head! __________________ 68 K-10,79 K-10,80 C-30 57 chevy convertible 79 Z28

06-13-2005, 10:35 AM	#10
72c5 Registered User Join Date: Dec 2003 Location: Boston Posts: 311	I bought a new t-stat housing and sender from LMC...........the sender would not fit any of the holes in the Edlebrock RPM manifold or the vortec heads...........I actually had to try a couple housings, one would not match up w/ the rad hose correctly. Last edited by 72c5; 06-13-2005 at 03:31 PM.

06-08-2005, 07:14 PM	#2
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,982	I have seen this question asked several times, and have yet to see an answer. For my truck I found a water neck (thermostat housing) from an early '80s car that had the right size threaded hole in the top of it for the temperature sender. It's not the ideal location for the sender, but it works.

06-09-2005, 12:55 PM	#3
724wdcopper graphic designer Join Date: May 2004 Location: Spokane, Washington Posts: 841	i asked this question a month or two ago, like said, not much in the way of answers. best bet is to drill out manifold and mount temp sender there.

06-09-2005, 02:03 PM	#4
PMS Registered User Join Date: Aug 2004 Location: Overland Park, KS Posts: 79	I used an aftermarket GM intake and it had the correct size hole by the thermostat housing. I just re-located wiring to new location.

06-09-2005, 02:43 PM	#7
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,982	If I remember correctly, the newer smaller senders have higher resistance than the older larger senders, so adding a resistor inline with a newer sender will make the situation worse. It might be possible to connect a resistor between the terminal of the sender and ground to lower the resistance, but we would need to know the specs of the new and old sensors in order to size the resistor correctly.

06-13-2005, 03:27 PM	#11
adkphoto Registered User Join Date: Apr 2000 Location: Camillus, NY USA Posts: 79	I plugged the hole on my Vortec heads and mounted the temp sensor at the thermostat housing... works like a charm, inexpensive, and has 0 chance of screwing up your heads. D __________________ 1972 Chevy Cheyenne Super LWB Chevy Red/White with rally wheels. Not-so-Stock 350, A/T, A/C, tilt. Vroom, Vroom.... ===================== David Colbert dcolbert@twcny.rr.com Work hard, play harder!

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