1966 427 425 correct thermostat housing

[Peter L.]

Re: 1966 427 425 correct thermostat housing

Joe - Send an E-mail to the '66 Judging Team Leader, Bill Calorico. It would probably be useful to indicate the sentence and/or paragraph of interest and a suggested revision. Pete

[Joe R.]

Re: 1966 427 425 correct thermostat housing

Joe - Send an E-mail to the '66 Judging Team Leader, Bill Calorico. It would probably be useful to indicate the sentence and/or paragraph of interest and a suggested revision. Pete

Pete,

I sent Bill an email yesterday asking for a possible correction to the 66 TIM&JG. I'll report back what I find out.

On a side note, is the part number for the 65 L78 (396) also 3877660?

Thanks,
Joe

[Peter L.]

Re: 1966 427 425 correct thermostat housing

Joe - I quite sure that the '65 396 did NOT use the 660. I'm sure one of the 396 guys will confirm. Pete

[Joe R.]

Re: 1966 427 425 correct thermostat housing

Joe - I quite sure that the '65 396 did NOT use the 660. I'm sure one of the 396 guys will confirm. Pete

Pete,

OK, thanks for the quick response. That was implied in some of the previous posts in this thread, but I wanted to make sure.

Joe

[Wayne M.]

Re: 1966 427 425 correct thermostat housing

Joe - I quite sure that the '65 396 did NOT use the 660. I'm sure one of the 396 guys will confirm. Pete

'65 L78 took coolant outlet part # 3827369 (and an aluminum spacer between it and the manifold). Believe the '369' also found on other GM products '66-up.

[Jack H.]

Re: 1966 427 425 correct thermostat housing

Plus, wasn't this part produced both by Saginaw and Tonawanda foundries? Some have suggested that as another variable in the neck vs. flange positioning...

[John H.]

Re: 1966 427 425 correct thermostat housing

Plus, wasn't this part produced both by Saginaw and Tonawanda foundries? Some have suggested that as another variable in the neck vs. flange positioning...

Jack -

I don't think either the Saginaw or Tonawanda foundries had aluminum die-casting capability in the 60's; I believe the 660 housing was purchased.

[Joe L.]

Re: 1966 427 425 correct thermostat housing

Pete,

I sent Bill an email yesterday asking for a possible correction to the 66 TIM&JG. I'll report back what I find out.

On a side note, is the part number for the 65 L78 (396) also 3877660?

Thanks,
Joe

Joe------


Besides everything else that's been said, the GM #3877660 thermostat housing did not even exist during the 1965 model year, so it could not have been used for 1965 L-78. The 3877660 was first used for 1966 model year applications.

[David L.]

Re: 1966 427 425 correct thermostat housing

The coolant outlet for a 1965 Corvette (396) does not appear in my 1965 Chevrolet part catalogs until the May 1965 issue. The GM part number is 3827369 in GR. 1.153. As I remember the 396 option was not available until sometime in the middle of the 1965 production.

Dave

[Joe R.]

Re: 1966 427 425 correct thermostat housing

Pete,

I sent Bill an email yesterday asking for a possible correction to the 66 TIM&JG. I'll report back what I find out.

On a side note, is the part number for the 65 L78 (396) also 3877660?

Thanks,
Joe

I ran into Bill at the Joplin regional and asked him about my email. He said that he had probably deleted it. He then asked me if I had an original car. I said no. I then asked if he had access to this board. He said yes. I next asked if he would look at this thread. He said something like, "No, but you can email the contents to me.". That doesn't sound very practical to me.

So the question is, does anyone have a 66 with a known original 660 water neck?

I looked at 4 cars at the regional, all had one recess on one side.

Joe

[Michael H.]

Re: 1966 427 425 correct thermostat housing

I ran into Bill at the Joplin regional and asked him about my email. He said that he had probably deleted it. He then asked me if I had an original car. I said no. I then asked if he had access to this board. He said yes. I next asked if he would look at this thread. He said something like, "No, but you can email the contents to me.". That doesn't sound very practical to me.

So the question is, does anyone have a 66 with a known original 660 water neck?

I looked at 4 cars at the regional, all had one recess on one side.

Joe

Send him this link. It should take him directly to this discussion.

https://www.forums.ncrs.org/showthre...56281&uid=4660

[Jim C.]

Re: 1966 427 425 correct thermostat housing

My first 1966 Corvette (#16401) 327/300 used a thermostat housing with part number 3877660 on the flange. My current 1966 (#27592) 327/300 also has a thermostat housing with part number 3877660 on the flange. Based on certain information I have pertaining to both cars, I'm confident that both thermostat housings are original to their respective cars.

Jim C.

[Ronald L.]

Re: 1966 427 425 correct thermostat housing

Joe,

What dimple are you referring to?

The one in that ebay sale had one on the long bolt side and two on the short bolt side. If you look carefully in those dimples, you will see ejection pin bosses.

Another thing to study is the cavity number. The parts that are considered 68 or later - with the number on the neck, what cavity numbers are you seeing?

Even in 1966 for usage on Chevelle, Corvette and others one cavity would not have been able to keep up. If there was a different supplier - chances are that the Tonawanda plant got theirs from a different location versus Flint.


I saw an odd feature - a die cast ejection pin boss partially up the neck - in what appeared to be a repro, don't know where that photo is right now, but I have never seen that on old parts from the 70's or from original cars.

I hope you make progress on the 66 JG - keep us in the loop!

[Joe R.]

Re: 1966 427 425 correct thermostat housing

My first 1966 Corvette (#16401) 327/300 used a thermostat housing with part number 3877660 on the flange. My current 1966 (#27592) 327/300 also has a thermostat housing with part number 3877660 on the flange. Based on certain information I have pertaining to both cars, I'm confident that both thermostat housings are original to their respective cars.

Jim C.

Jim,

Can you provide some pictures?

Joe

[Joe R.]

Re: 1966 427 425 correct thermostat housing

Send him this link. It should take him directly to this discussion.

https://www.forums.ncrs.org/showthre...56281&uid=4660

Michael,

I asked him that already. He said he wouldn't look at it.

Joe