part number for 69 L46 heat riser valve

[Richard R.]

I need to replace my original heat riser valve on my 69 L46 350. I have tried repros but they just don't fit right, and in most cases interfere with the starter shield. I can't find a part number in the AIM. Does anyone know what the 2" heat riser part number is? I will use that to source a correct original if I can find one.

Thanks,
Rich

[Peter H.]

Hello Richard The GM Part # You Need Is 3887024. Happy Hunting
Peter 🇨🇦

[Keith M.]

I have seen 362652. Maybe that is the service replacement and 3887024 is original number? Gm Parts Wiki comes up empty on 3887024. Also don't be confused with 3746844 which I believe is a casting number.

[Jeffrey S.]

Keith,
The heat valve assembly is shown in the AIM in section 6 (engine) page C2. It is #14, part number 3887024 "VALVE ASM". Hope this helps.
Jeff

[Patrick H.]

Also don't be confused with 3746844 which I believe is a casting number.

However, most sellers will list the part under 3746844, so you can find them that way more often than under the original part number. Once it's off the car or the box is gone, 3746844 is all that you've got.

[Duke W.]

Do a Web search "3887024 valve". Do the same for 362652. Some vendors claim "NOS". The ...652 was released in the early seventies for production and became the service replacement for the previous ...024 heat riser valve back to '57. I don't know what, if any, visual differences there are between the two.

If the repros don't fit, then, assuming you're installing the valve in the correct orientation, it's probably not correctly manufactured to the OE design specs.

You should notify the vendor. There appear to be many issues with "reproduction" parts that are mostly manufactured offshore, but vendors keep selling them, so if you receive an ill-fitting part it's very important to provide feedback to the vendor so they stop selling the part until any fit or quality issues are corrected.

Duke

[Jeffrey S.]

I just checked eBay and there are 2 listed NOS in the box. One for $500+ and 1 for $750. Yikes!!
Jeff

[Patrick H.]

I just checked eBay and there are 2 listed NOS in the box. One for $500+ and 1 for $750. Yikes!!
Jeff

That's why you need to search alternate numbers.
I have picked some up for no more than $50.

[Joe L.]

I have seen 362652. Maybe that is the service replacement and 3887024 is original number? Gm Parts Wiki comes up empty on 3887024. Also don't be confused with 3746844 which I believe is a casting number.

Keith-----


Yes, the original heat riser valve for 1969 Corvette small blocks was GM #3887024 which is a 2" valve. That valve was discontinued in May, 1976 and replaced by GM 63 radiator The latter was discontinued without supercession quite a few years ago. Both valves are very similar in configuration and were not used exclusively on Corvettes but on a wide variety of other Chevrolet and GM applications.

By the way, the predecessor to the 3887024 was the GM #3746838. It is also very similar to the 3887024 and can be used for Corvettes originally using the 3887024 valve as well as C1 and C2 small blocks with 2" exhaust.

[Patrick H.]

Keith-----


Yes, the original heat riser valve for 1969 Corvette small blocks was GM #3887024 which is a 2" valve. That valve was discontinued in May, 1976 and replaced by GM 63 radiator

I’m guessing that a 63 radiator didn’t replace a 2” heat riser valve…
I think something happened to your number.

[Joe L.]

I’m guessing that a 63 radiator didn’t replace a 2” heat riser valve…
I think something happened to your number.

Patrick-----

I missed that. This has to do with some sort of "idiosyncrasy" somehow "embedded" in the new DB software. I've had it happen before but I caught it right away or, at least, before the editing option for my response expired. In this case, that did not happen. It seems that when a certain text usually beginning with "GM #" is included in a post, the software changes it to something else, usually an absurdity. That's what happened here.

Instead of "63 radiator" it should be GM #362652.

[Larry E.]

If one is forced to use one of the "reproduction" heat rise valves you can assume that the
flapper inside will start rubbing sooner then later. (Been there;done that) Good chance
that when it starts this it will be in the "Closed" position. This can and will cause serious
problems. That being said I would recommend taking the flapper out of the housing. This
can be done with a dremel tool. Picture Below. It will be a lot easier now compared if it was
installed with it. JMHO>Larry