1966-1973 GM Thermostat Housing Water Neck Small or Big Block 350 396 427 454

Unless otherwise noted this is a used part. A used part may have dust, dirt, old paint, scratches or cracks. These are not new parts unless noted so please set your expectations accordingly. See pictures for condition and wear as we rely heavily on photos. Applications are based upon various sources, although I try to make sure research is correct it can be flawed so please verify your applications. Please use a PC to take advantage of the zoom feature as it will provide much greater detail than a portable device. Free shipping is to the lower 48 states only. If you live in Alaska, Hawaii, Puerto Rico or any other US territory please contact us directly for a shipping quote. * * * Hard to find Mopar Parts Original Ford parts Original GM Muscle car parts Factory high performance parts ## Items Specifications 1966 1967 1968 1969 1970 1971 1972 1973 GM Thermostat HousingWater Neck Small or Big Block 350 396 427 454 BrandGeneral Motors Country of OriginUnited States Manufacturer Part Number3877660 Performance PartNo Superseded Part Number05062417 Vintage PartYes #### Shipping 5 days handling time, slightly longer for larger freight items.   Free shipping is to the lower 48 states.   Please contact us directly for shipping quotes elsewhere. #### Return 30 day returns for new and used parts. #### Delivery We utilize all shipping companies and freight providers to ensure we can deliver any part you need for your project. The box was actually made specifically for what I bought. I have never seen this before. There was three layers of cardboard with heavy tape. There was no way this could have been damaged or moved inside the box. The box fit it Perfectly. When I got to it, it was surrounded with bubble wrap. I am very happy with this. it is exactly what the photos depicted. This is so much better than what I have. Whatever they have, I could use I’m buying. This company would get 10 stars if possible. The instrument gauge bezel for my 1984 Bronco ll was better than advertised. Thank you. I will save the seller. Absolute Best !! Very professional remedy with small glitch. Was very impressed with communication, packing. Hope to do business again People ! Let me just tell you how awesome this seller is! First off the parts were in better condition than the photos! They were safely packed, in fact so well even I had a hard time unwrapping the parts. It was shipped in great time! And most of all the seller communicated with me several times every step of the way until my parts got to me! The best seller so far I’ve dealt with buying my car parts! Thank you so so much !!! ## FAQs **Is this an original OEM part or a reproduction?** The overwhelming majority of our parts are vintage original parts from the manufacturer that you know will fit right! However, when we purchase collections there are some rare occasions that reproduction parts are part of the lot. When this occurs, we notate those reproduction parts, so you’ll know exactly what to expect. **Do you accept returns if it doesn’t fit or work?** We stand behind all our parts. If something doesn’t meet your expectations, we will accept your return. There are a very few select listings where there are known issues. We call those issues out and then even announce that this item is for parts and we are offering it with no returns. We will be clear so you can have healthy expectations going into the buying process. **Can you provide more photos or measurements?** Absolutely! And we do this on a regular basis for our customers. We want to be sure you’re comfortable and educated throughout the process from purchase to delivery! **How long will it take to arrive?** We ship Tuesday through Friday so the wait is never long. We utilize a 5-day window for processing your order as we are oftentimes selling items that do not fit in a square box. Every order is unique and so every order has a unique handcrafted box made from recycled cardboard that’s bubble wrapped and double boxed to ensure a safe delivery to your door. Our damage rate is near zero because of the care we take. We will also let you know when your item has shipped, and that a tracking number is available to chart the progress of your order. If you do not see a shipping price available to you, then your home country is blocking its availability. If you contact us, we can provide you with some brokers that may still be able to get that special part to you. Copyright © 2025 All rights reserved \| Designed by MyListerHub #### Business Hours Mon-Fri - 9am-5pm #### Selling Car Parts Since 1995 

• Brand: General Motors
• Manufacturer Part Number: 3877660