heater hose gm correct numbers

[rsorg]

hi, does anybody have the correct factory numbers for the heater hose ,water pump ,and clamps ,i believe there are 2 sizes 3/4 and 5/8ths  thanks roger

[cny first gen 71]

Yes 3/4 and 5/8 are what you will need. I believe someone out there makes factory correct hoses but not sure who. I replaced my water pump a few years with a new pump not a remanufacured unit looks factory correct. If I remember correctly I got it at a local parts store.

[Chevy Dave]

I don't believe that original heater hose had any numbers on them  They sell heater hose with GM logos on them, but  none of the GM cars I owned in the 70s had them. I remember black hose with ribs on them.

[Dtret]

Agreed. No numbers. Not positive but I think one of the heater hoses was ribbed and the other was not.  I think the bypass hose was ribbed also 

[Chevy Dave]

I use NAPA Fleet or Gates Green Stripe heater hoses. These hoses last a long time and are the best that I have found. You can hide the green stripe on the Gates or the gold stripe on the NAPA buy rotating the hoses. You also could  use a wide black marker to color the stripes.