Anyone know the correct part number for a 1966 427 425 thermostat housing?
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Re: 1966 427 425 correct thermostat housing
Thanks Joe, the one I have is correct.
Thanks again!Comment
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Re: 1966 427 425 correct thermostat housing
I believe the casting number should be on the flange for '66 and not on the neck.Comment
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Re: 1966 427 425 correct thermostat housing
Is this then confirmed that the repro having the same part number is up on the neck while the original os on the flange?Comment
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Re: 1966 427 425 correct thermostat housing
Not necessarily, the '660 was used in GREAT quantities between 1966 and the early 70's in a wide variety of applications. Newer tooling relocated the part number to the neck, sometime during that timeframe, but that doesn't exclude the earlier design from being in production also throughout the production run. General consensus from observation of original '66 cars is that the flange location is seen in '66 and that the neck location appeared later. Perhaps a student of water necks (I'm not) has more definative timing. There are a LOT of the water necks out there, I'm not certain if anyone has reproduced them.Bill Clupper #618Comment
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Re: 1966 427 425 correct thermostat housing
The part with the PN on the neck is readily available from Paragon and others.
Would be good to hear from a 'student of thermostat housings' and or from those with original unmolested cars.
These were aluminum and did corrode so a 35 year old part, while looking original just might be the 2nd part on the car given the durability of parts back then.Comment
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Re: 1966 427 425 correct thermostat housing
Ron -
I have the drawing, and it notes that the part number location is "optional"; Paragon has tooled their reproduction with the number on the neck (and their "PR" logo on the inside).
There were multiple sources for the part - most I've seen prior to '68 have the part number on the flange, and most '68-up have it on the neck, although the original on my untouched '69 Z/28 also has it on the flange.Comment
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Re: 1966 427 425 correct thermostat housing
Ronald - Also, please check the archives. Bill and John make some interesting points and I'll add my experience/comments on the 66 327 Chevelle and 66 & 67 Base Motor Corvettes I have that use the 660 therm housing and the numbers are not all on the base. I know it's a very small sample pool. I think we know that there were more than one supplier back then and from info I have seen the supplier was required to put the part number in the part but it was their call as to where they placed it. So, my read is that I don't think we know based on factory drawing or research specifically that the number should be in one place, i.e. on the base or on the neck for certain years. Since everyone has their opinion and experience that they are entitled to, which of course is usually based on their car, we might say we know but as far as I know no one has produced documented evidence to support these conclusions. Are we having fun yet.
Pete
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Re: 1966 427 425 correct thermostat housing
John, Peter, and William,
Archives were reviewed to the extent one can find something based upon search terms. This thread was the most appropriate and was able to bring the topic back up and gain clarity. Most important, appreciate the input from all.
The part on my car has the number on the neck, but it has been there a very long time, can't say for sure 44 years, has a touch or two of what appears to be original orange which given the events of 1975 would indicate it as the original but we are not sure.
So given that we know it has been untouched since 1975 and well before Paragon existed and or before the prior owner started making repo parts up there. But given that, it could have been an over the counter GM part from the mid 70's too. Its staying put given if it isn't broke, don't fix it.Comment
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Re: 1966 427 425 correct thermostat housing
My 66 L72 water neck has the part number on the neck. I decided to buy one on ebay that has the number on the base. There is one thing in the JG that is confusing me, though. Here it is:
"There is a recessed web area on each side of the two attaching bolts."
Mine has two recessed areas near the short bolt, but only one near the long bolt. All the ones on ebay right now just have the one recessed area near the long bolt, too. That includes parts that have the number on the base and the neck. What gives?
Here's an example of the early style part:
Thanks,
JoeComment
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Re: 1966 427 425 correct thermostat housing
Joe,
I think that is what they mean, you have a web next to the bolt.
I also replaced the 68 up version with one with the numbers on the flange, last summer.
If you are looking for a second web next to the long bolt - I have never seen one like that, there's not place for it either.
I think you are good with what you have.Comment
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Re: 1966 427 425 correct thermostat housing
Joe - As you probably know, the 660 housing had numerous Chev/Corv sb & BB applications, so there is not a unique BB 660.
I checked my 66 Chevelle & 67 Corvette (both are sbs) & the 660s on them that I believe are originals and they are configured like the eBay photo.
So, my read is that there is a proofing err in the manual. Hopefully, it will be revised and clarified in the next edition.
PeteComment
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Re: 1966 427 425 correct thermostat housing
Pete,Joe - As you probably know, the 660 housing had numerous Chev/Corv sb & BB applications, so there is not a unique BB 660. I checked my 66 Chevelle & 67 Corvette (both are sbs) & the 660s on them that I believe are originals and they are configured like the eBay photo.
So, my read is that there is a proofing err in the manual. Hopefully, it will be revised and clarified in the next edition.
Pete
Cool, that confirms what I was thinking. What is the process to request a change to the JG?
JoeComment
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