Heater core hose size?

[outatime86]

Quick question; what is the size of the inlet and outlet on the heater core?
I'm at work but want to get a flush kit later today and forgot, I think its 5/8 or 3/4?

Thanks in advance

 

[TurboTGuy]

https://www.highwaystars.net/heater-hose-heater-core-to-pipe-25525214/

Maybe they can tell you.

 

[N2BUICK]

Not knowing if your question was answered, I came across my spare heater core. I saw they were not the same size. 5/8" and 3/4"

 

[outatime86]

Not knowing if your question was answered, I came across my spare heater core. I saw they were not the same size. 5/8" and 3/4"

Thank you for the info and the picture! Answered my question perfectly

I wonder why Buick did the different sizes

 

[outatime86]

Was able to knock out the heater core flush. Bought 5 ft of each 5/8 and 3/4 inner diameter PVC clear hose. And one female end garden hose to Barb 3/8, came with a clamp. Turned on hose with low pressurer, stuff was nasty. I did flush then switched to backflush three times each. Once the hose water was clear in the bucket instead of just stopping there KINK the hose stopping the flow and then releasing bursts got out many chunks.