91 sbc swap no second port for heater core - The 1947 - Present Chevrolet & GMC Truck Message Board Network

leonphelps · 02-04-2018, 05:21 PM

Hello,

Trying to figure out how to plumb my heater core. My engine is a 91 sbc from a caprice classic. There is only one connection for the core since the original car had a nipple on the radiator.

Saw this online, wondered if anyone else has a different solution? My radiator is brand new aluminum. Top hose is a flex hose one from napa. Bottom is a thick (1 3/4" I believe) hose. I need the 90 degree angle for the top hose. Pointing away from the engine would make the hose need to be another 12" long, and I dont like appearance of that.

https://www.ebay.com/itm/Racing-Powe....c100677.m4598

Thanks for any suggestions.

bama63 · 02-04-2018, 05:32 PM

heater hoses go one hose to intake and other to top of water pump.

**The Rocknrod** · 02-04-2018, 06:04 PM

As an example:

**72cs20** · 02-04-2018, 07:13 PM

Is this an TBI engine? If so, look at the passenger side rear of the intake manifold and there should be a water port there for your heater core connection, along with the one on the water pump.

Pontiacgurudan · 02-04-2018, 11:36 PM

If there is no hose fitting on your water pump there will be a plug you can remove and install the correct fitting. I had to do the same on my tbi motor in my 63.

66_c10_tpi · 02-05-2018, 10:27 PM

I had the same issue with my motor. It is a 92 TPI motor. The thermostat housing you are showing will not work. What I had to do is replace the water pump if my memory is correct out of a truck for the same year. If you have a serpentine belt system be sure and get a counter clockwise rotation pump.

02-04-2018, 05:21 PM	#1
leonphelps Registered User Join Date: Oct 2016 Location: Pa Posts: 69	91 sbc swap no second port for heater core Hello, Trying to figure out how to plumb my heater core. My engine is a 91 sbc from a caprice classic. There is only one connection for the core since the original car had a nipple on the radiator. Saw this online, wondered if anyone else has a different solution? My radiator is brand new aluminum. Top hose is a flex hose one from napa. Bottom is a thick (1 3/4" I believe) hose. I need the 90 degree angle for the top hose. Pointing away from the engine would make the hose need to be another 12" long, and I dont like appearance of that. https://www.ebay.com/itm/Racing-Powe....c100677.m4598 Thanks for any suggestions.

02-04-2018, 05:32 PM	#2
bama63 Registered User Join Date: Jun 2010 Location: gadsden, alabama Posts: 468	Re: 91 sbc swap no second port for heater core heater hoses go one hose to intake and other to top of water pump. __________________ Due to financial constraints, the light at the end of the tunnel will be shut off until further notice

02-04-2018, 06:04 PM	#3
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: 91 sbc swap no second port for heater core As an example: __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?

02-04-2018, 07:13 PM	#4
72cs20 Senior Member Join Date: Jul 2014 Location: Los Gatos, Ca. Posts: 407	Re: 91 sbc swap no second port for heater core Is this an TBI engine? If so, look at the passenger side rear of the intake manifold and there should be a water port there for your heater core connection, along with the one on the water pump. __________________ 1966 K20 flatbed build thread - http://www.67-72chevytrucks.com/vboa...d.php?t=768827 62 C20 build thread - http://67-72chevytrucks.com/vboard/s...d.php?t=703583

02-04-2018, 11:36 PM	#5
Pontiacgurudan Registered User Join Date: Feb 2017 Location: Desoto mo Posts: 106	Re: 91 sbc swap no second port for heater core If there is no hose fitting on your water pump there will be a plug you can remove and install the correct fitting. I had to do the same on my tbi motor in my 63. Attached Images

02-05-2018, 10:27 PM	#6
66_c10_tpi Registered User Join Date: Mar 2011 Location: Georgetown,IL Posts: 62	Re: 91 sbc swap no second port for heater core I had the same issue with my motor. It is a 92 TPI motor. The thermostat housing you are showing will not work. What I had to do is replace the water pump if my memory is correct out of a truck for the same year. If you have a serpentine belt system be sure and get a counter clockwise rotation pump.



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