Heater core

[WFarm]

I’ve read quite a few threads here dealing with heater cores and many recommend a Summit brass unit. Is this the correct one? (1975 Blazer, with air, originally had a 350)

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[Snoots]

That's a good unit. I have a HAYDEN in mine for over 15 years. They're getting darn expensive!

 

[PrairieDrifter]

Not necessarily a summit brand. Just easy to find brass units on summit.

 

[ali_c20]

Have one of these, works and fits as it should.
It's the right part for your K5.

 

[WFarm]

I ordered the brass Summit core, but based on comments here about the aluminum cores not being a good fit I took my old core to O’Reilly’s to compare to their aluminum Murray brand.

Not a good fit! My old core is stamped Harrison, so for all I know it may be the original. It was a perfect fit to the heater box. Comparing the two cores there is a definite visual and dimensional variance. Would the Murray work? Probably, but it would have a poor fit and not sure how much this would affect things.

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[Oliver]

I just installed one from NAPA, works and fit fine.

 

[Rustisbest]

Another vote for the one from Summit.

 

[PrairieDrifter]

I ordered the brass Summit core, but based on comments here about the aluminum cores not being a good fit I took my old core to O’Reilly’s to compare to their aluminum Murray brand.

Not a good fit! My old core is stamped Harrison, so for all I know it may be the original. It was a perfect fit to the heater box. Comparing the two cores there is a definite visual and dimensional variance. Would the Murray work? Probably, but it would have a poor fit and not sure how much this would affect things.

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That's the problem with the parts store units. They don't fit properly. That's why the summit units have been recommended for a long time now.

 

[WFarm]

New core arrived today from Summit and is pretty much identical to the one old Harrison core. Very pleased.

GMSB Rocks.

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