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Discussion Starter · #1 ·
What is the correct number thermostat housing on an 65 L 78?
 

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Discussion Starter · #3 ·
The motor came from a '65 impala and is now in a 66 chevelle. 396/425
 

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The last three digits are 660. Chevy used that on a lot of cars. The 65-67/68 version of the casting number on the base of the housing. 68 on up were on the neck. The repro version is the part number on the neck.
 

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Discussion Starter · #5 ·
Thanks Keith. I know there was a curved one for the corvette that ended in 369, another that ended in 128, but I think 660 is the correct one for the 396/425.
 

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Thanks Keith. I know there was a curved one for the corvette that ended in 369, another that ended in 128, but I think 660 is the correct one for the 396/425.
I think the ones your think of are cast iron and was used on L76/ L79 cars in vettes and other cars, the 660 is aluminum
 

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If you have the engine in a 66 then the 660 is the water neck you want use along with a 66 radiator hose so that it mates up to your radiator correctly.

But to correctly answer the original question, a 65 L78 or L37(Z16) used the cast iron water neck from the 63 Vette fuelie motor, and they were spray painted silver to roughly match the aluminum intake. I don't remember the casting number, but here are some pics of the NOS one on the motor for my second Z16:

Chevelle Tech - jeffschevelle's Album: Z16 Engine Restored - Picture

Chevelle Tech - jeffschevelle's Album: Z16 Engine Restored - Picture
 
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