1978 upper radiator hose 4.8 swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chevyrides · 10-19-2021, 10:55 AM

I have read that people are using the stock 1999-2006 upper hose for their swap. The radiator side of this hose is 1.25" I.D. and my stock radiator is about 1.5". Are they using a 1.25" - 1.5" reducer or do some radiators have a 1.25" connector?

tinydb84 · 10-19-2021, 01:41 PM

Quote:

Originally Posted by chevyrides

I have read that people are using the stock 1999-2006 upper hose for their swap. The radiator side of this hose is 1.25" I.D. and my stock radiator is about 1.5". Are they using a 1.25" - 1.5" reducer or do some radiators have a 1.25" connector?

My upper and lower hoses matched my radiator but I am using a 75 C20 radiator.

ICT Billet makes an adapter: https://www.amazon.com/Splice-Couple...s%2C220&sr=8-4

chevyrides · 10-23-2021, 11:14 AM

I ended up buying a Spectra Premium CU161 radiator off Amazon and the 1999-2006 upper and lower radiator hoses worked perfect. The upper hose connection was stepped 1-1/4" - 1-1/2"

10-19-2021, 10:55 AM	#1
chevyrides Registered User Join Date: Apr 2018 Location: Campbell River, BC Posts: 7	1978 upper radiator hose 4.8 swap I have read that people are using the stock 1999-2006 upper hose for their swap. The radiator side of this hose is 1.25" I.D. and my stock radiator is about 1.5". Are they using a 1.25" - 1.5" reducer or do some radiators have a 1.25" connector?

10-23-2021, 11:14 AM	#3
chevyrides Registered User Join Date: Apr 2018 Location: Campbell River, BC Posts: 7	Re: 1978 upper radiator hose 4.8 swap I ended up buying a Spectra Premium CU161 radiator off Amazon and the 1999-2006 upper and lower radiator hoses worked perfect. The upper hose connection was stepped 1-1/4" - 1-1/2"

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