Water pump heater hose size? Straight six 292 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Asshat · 05-04-2021, 12:38 AM

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 don’t think there is 7/8” heater hose, is there?

**The Rocknrod** · 05-04-2021, 07:40 AM

Gates makes a 7/8" heater hose but I thought the heater hoses were 3/4" and 5/8".

Asshat · 05-04-2021, 10:44 AM

Quote:

Originally Posted by The Rocknrod

Gates makes a 7/8" heater hose but I thought the heater hoses were 3/4" and 5/8".

I thought so too. The water pump outlet for the heater is not 5/8” or 1” Is.

**The Rocknrod** · 05-04-2021, 11:05 AM

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.

Asshat · 05-04-2021, 11:31 AM

Quote:

Originally Posted by The Rocknrod

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.

Not sure what that has to do with National Pipe Thread sizes.
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?

**The Rocknrod** · 05-04-2021, 11:58 AM

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?

Asshat · 05-04-2021, 05:28 PM

Quote:

Originally Posted by The Rocknrod

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?

Yes - I it is the 63-64 292 version.

Asshat · 05-04-2021, 05:47 PM

Pics...
Thought I had more; I’ll have to post some later this evening.

05-04-2021, 12:38 AM	#1
Asshat Registered User Join Date: Jul 2015 Location: South Orange County CA Posts: 1,265	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 don’t think there is 7/8” heater hose, is there? __________________ 1963 C20, small window, long bed 292, 4-speed

05-04-2021, 07:40 AM	#2
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	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". __________________ 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?

05-04-2021, 11:05 AM	#4
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	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. __________________ 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?

05-04-2021, 11:58 AM	#6
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	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? __________________ 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.

05-04-2021, 05:47 PM	#8
Asshat Registered User Join Date: Jul 2015 Location: South Orange County CA Posts: 1,265	Re: Water pump heater hose size? Straight six 292 Pics... Thought I had more; I’ll have to post some later this evening. Attached Images __________________ 1963 C20, small window, long bed 292, 4-speed



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