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05-04-2021, 12:38 AM
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#1 |
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Registered User
 
Join Date: Jul 2015
Location: South Orange County CA
Posts: 1,265
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Water pump heater hose size? Straight six 292
The formed water pump return hose is 1 ID; and it seems to me the heater hose outlet is 7/8. The one from the thermostat is 5/8.
I dont think there is 7/8 heater hose, is there?
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1963 C20, small window, long bed 292, 4-speed |
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05-04-2021, 07:40 AM
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#2 |
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Moderator
  
Join Date: Aug 2011
Location: China Spring, TX
Posts: 7,280
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Re: Water pump heater hose size? Straight six 292
Gates makes a 7/8" heater hose but I thought the heater hoses were 3/4" and 5/8".
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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? |
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05-04-2021, 10:44 AM
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#3 | |
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Registered User
Join Date: Jul 2015
Location: South Orange County CA
Posts: 1,265
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Re: Water pump heater hose size? Straight six 292
Quote:
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1963 C20, small window, long bed 292, 4-speed |
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05-04-2021, 11:05 AM
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#4 |
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Moderator
Join Date: Aug 2011
Location: China Spring, TX
Posts: 7,280
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Re: Water pump heater hose size? Straight six 292
Oh I think I see what might be the issue. If you look at a National Pipe Thread Reference Chart you'll see that a 3/4" Pipe thread is a tad over 1", they don't go by the normal nut and bolt references most of us are used to.
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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? |
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05-04-2021, 11:31 AM
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#5 | |
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Registered User
Join Date: Jul 2015
Location: South Orange County CA
Posts: 1,265
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Re: Water pump heater hose size? Straight six 292
Quote:
The water pump connections are cast. Just not sure why they chose a size different than the standard heater hose size. Unless it was intended to match the heater core inlet, which is also larger than 5/8”. Is there a special hose from the factory that went from the water pump to the heater core?
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1963 C20, small window, long bed 292, 4-speed |
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05-04-2021, 11:58 AM
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#6 |
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Moderator
Join Date: Aug 2011
Location: China Spring, TX
Posts: 7,280
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Re: Water pump heater hose size? Straight six 292
Maybe you can find a dual ID heater hose like this as an example - https://www.amazon.com/Gates-18083-H.../dp/B00LGPIWN0
It's hard to tell what your looking for though, no pics. is it in this pic? bses49BSDYLnb!c!~~60_57.JPG)
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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? Last edited by The Rocknrod; 05-04-2021 at 12:42 PM. |
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05-04-2021, 05:28 PM
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#7 | |
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Registered User
Join Date: Jul 2015
Location: South Orange County CA
Posts: 1,265
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Re: Water pump heater hose size? Straight six 292
Quote:
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1963 C20, small window, long bed 292, 4-speed |
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05-04-2021, 05:47 PM
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#8 |
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Registered User
Join Date: Jul 2015
Location: South Orange County CA
Posts: 1,265
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Re: Water pump heater hose size? Straight six 292
Pics...
Thought I had more; I’ll have to post some later this evening.
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1963 C20, small window, long bed 292, 4-speed |
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