The 1947 - Present Chevrolet & GMC Truck Message Board Network

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- - 1978 upper radiator hose 4.8 swap (https://67-72chevytrucks.com/vboard/showthread.php?t=826977)

chevyrides

10-19-2021 10:55 AM

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?

tinydb84

10-19-2021 01:41 PM

Re: 1978 upper radiator hose 4.8 swap

Quote:

Originally Posted by chevyrides (Post 8985709)

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

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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