EARLY #330813 Water Pumps

[Lynn H.]

Hey guys, I know I promised to stop flogging the water pump thing, but one more observation/question, after some further inspection today.

I have Colvins books (all of them), and both the 70-75 book, and Corvette BTN book carry the notation on the 3991399 pump-
"the latest verified casting date for the #3991399 is March 1972"
and also-
"the earliest verified casting date for #330813 is April 1972"

I have a 4 of the 330813 and found a significant difference on 1 of the pumps when I looking at them today, it is a pump dated E4 2.
From the information in the BTN books that would indicate this is a fairly early 330813 pump and it is NOT drilled out, and tapped on the by pass boss. The print for the pump in the book shows it to be drilled and tapped.
So I guess my questions are:
Is this common on those ealry "813" pumps?
And is this something that is "known" or "looked for" in these pumps on the late 72 cars?
Thanks once again,
Lynn Houk

[Jack H.]

Re: EARLY #330813 Water Pumps

Yep, currently the JG books state the early versions of the 330813 were NOT drilled/tapped/plugged while later versions (sometime in '73?) became drilled/tapped/plugged.

Finding a virgin '813 housing that isn't drilled/tapped/plugged is TOUGH!

[Lynn H.]

Re: EARLY #330813 Water Pumps

WOW!! Thanks for the quick and interesting response Jack, I'm glad I noticed this today before just piling these up. My 72 Base car,(which is numbers matching project), did not have the correct water pump. Mine is an early car (OCT), so this pump is not correct for me, but maybe I will keep this as the best candidate until I find something better suited to my car, which should be the #3991399.
Again it is this kind of info that has made me decide to make this my home page, but I'm probably driving a few of you nuts!!!
I cannot thank you enough,
Lynn Houk

[Edward J.]

Re: EARLY #330813 Water Pumps

Lynn, my water pump is dated apr. 22 and is a 3991399,Patrick H. had a thread awhile back trying to figure out when the 3308813 pump can into production.It may be around late may on the 330813 pumps with boss.

[Lynn H.]

Re: EARLY #330813 Water Pumps

Yes, I think I will put this one back in the "Archives" (rather than sell to a rebuilder), if for no other reason that it seems like a great piece for converstion/debate on this subject. And I do LOVE to converse/debate (not so much debate)as you guys can tell. Being a VERY early May pump on the 4th, it seems to somewhat early, and even though Colvin has a documented April pump Ithink I hang onto it for now. Curious what day of the week that was, now I HAVE to go look that up.
The thirst for meaningless knowledge never ends........
Thanks guys,
Lynn

[Edward J.]

Re: EARLY #330813 Water Pumps

Lynn, Whats the vin no. of your car,I think Patrick may be interested in the vin. no. he was doing research for the next judging manuel changes,there must be some issues with the break date on the 3991399 pumps.

[Lynn H.]

Re: EARLY #330813 Water Pumps

Ed,
I am not certain that this pump came off the motor that is for my 72 Base, 4spd car (although it may have). My 72 just had a birthday (C25-October 25th) and it is #5619. I actually posted a thread about it's "birthday" earlier in the week as the "birthday book" shows it on the 26th, which could very well be when it actually rolled off the line. I did not know if anyone was updating that info., and I was curious who if so, and whether the BDB was calculated for trim tag dates, or actual roll off the line dates. Anyway, my 72 motor is mostly complete and correct and on an engine stand, but I removed the water pump off of it years ago. I do not rememebr if it was where I got this particular pump, all I remember from the time, is that the one that was on it was incorrect.
Makes me think of another "interesting" question"
When the line shut down at days end, how many unfinished cars actually were left sitting on the line waiting for the next day?
I bet the man who knows the answer to that is named John, and hopefully he will read this post and tell us.
Calling Mr. Hinckley.....

Lynn #28522

[John H.]

Re: EARLY #330813 Water Pumps

Makes me think of another "interesting" question"
When the line shut down at days end, how many unfinished cars actually were left sitting on the line waiting for the next day?
I bet the man who knows the answer to that is named John, and hopefully he will read this post and tell us.
Calling Mr. Hinckley.....

Lynn #28522

Lynn -

The short answer is "all of them" . The system stayed full from start-of-production job #1 to the last unit produced each model year. It never emptied-out except during model change downtime.

[Terry M.]

Re: EARLY #330813 Water Pumps

It is interesting that Bowling Green does it that way today -- well actually they did it that way up until these latest weekly or monthly shut downs. I don't knowwhat the do now with these extended shut downs. That is a lot of capital sitting on the line -- about 125 cars then, maybe less now.

[Lynn H.]

Re: EARLY #330813 Water Pumps

John,
Thanks for reading and posting. Maybe if I rephrased that question a little:
What was the capacity of the complete line, say from the very first station to the next to last station?
Maybe this is something you might just have a balllpark figure for as are know there would be many variables, including but not exclusive to, cars that were pulled aside with problems. Since I just received my first Birthday Book earlier this week, I wondered about a couple of my cars such as:
The car mentioned above with the C25 tag and C26 in the BDB, was probably most certainly sitting somewhere on the line overnight.
I also have an '80 that was the first day of production from the 1980 calender year(Jan 2, 1980). BDB shows last car for that day to be 11859, and the last car from 12/31 as 11652. My car is 11703 so I figured it probably sat on the line over the holiday.
I know goofy questions, my mind really wanders...
Thanks again,
Lynn

[Terry M.]

Re: EARLY #330813 Water Pumps

My 72 just had a birthday (C25-October 25th) and it is #5619. I actually posted a thread about it's "birthday" earlier in the week as the "birthday book" shows it on the 26th, which could very well be when it actually rolled off the line. I did not know if anyone was updating that info., and I was curious who if so, and whether the BDB was calculated for trim tag dates, or actual roll off the line dates.
Lynn #28522

[John H.]

Re: EARLY #330813 Water Pumps

John,
Thanks for reading and posting. Maybe if I rephrased that question a little:
What was the capacity of the complete line, say from the very first station to the next to last station?

Lynn -

There were roughly 135 units in the system from the first station on the body line in the Body Shop to the end of the Final Trim Line (last line station prior to Shipping).

[Lynn H.]

Re: EARLY #330813 Water Pumps

Terry,
I do agree with your thoughts, which got me to thinking about a couple other things (surprise, eh!!). As far as the BDB, I never had one and I am pretty much a Corvette book "JUNKIE" (roughly somewhere between 250-300 books), so I thought I would order one when I renewed my membership online last week. One reason was that I know of a car where the trim tag was "missing", and had looked at the end of the month numbers, but thought maybe could get "closer" information with the book. This discussion from late Friday made me go look at the trim tag from one of my cars, and I found something I thought VERY INTERESTING (to me anyway). I do not have time to get into right now (wife is out raking leaves and probably won't go over too good if I don't get my fanny out there-if you know what I mean), but I will be starting a new thread, as this gets into a whole different line of discussion. Please keep your eye out for my thread on the trim tag from the 1980 I had previously mentioned (that I thought may have spent the holiday sittting on the line). Turns out it may have spent more than just the holiday sitting somewhere, and I will get into this later today when I have more time. I will be very interested in your (and anyone elses') opinion on what I found. Something hopefully John H., will possiblly be able to shed some light on. I'm sure this sure this will leave you waiting with baited "fingers?". HA HA!!
Later...
Lynn

[Lynn H.]

Re: EARLY #330813 Water Pumps

THANKS AGAIN JOHN!!!
This is exactly what I was "wondering".
Lynn

[Patrick H.]

Re: EARLY #330813 Water Pumps

Lynn, Whats the vin no. of your car,I think Patrick may be interested in the vin. no. he was doing research for the next judging manuel changes,there must be some issues with the break date on the 3991399 pumps.

I think that Patrick may be very interested in that water pump.