c2 water pump

[Carmelo P.]

1967 L-79 build date 2/22/67
what would be a correct date code for the water pump?
available pumps 2/10/67 and 1/31/67, are these too new? thanks....

[Larry M.]

Re: c2 water pump

What date was your engine produced?? WP (ideally) needs to be a 1-3 weeks before this date.

Larry

[Carmelo P.]

Re: c2 water pump

It's a replacement CE gm block..

[Larry M.]

Re: c2 water pump

Then either pump you mentioned would work.......but I personally would pick the January one.

Larry

[Carmelo P.]

Re: c2 water pump

I agree. No date code I guess is a possibility ?

[Joe L.]

Re: c2 water pump

I agree. No date code I guess is a possibility ?

Carmelo------


By 1967 all Corvette waterpumps had date codes.

[Rocco S.]

Re: c2 water pump

My all original March 30 built '67 coupe with L79 engine has a water pump "326" with a date code of "L276" or December 27, 1966.

[Larry M.]

Re: c2 water pump

My all original March 30 built '67 coupe with L79 engine has a water pump "326" with a date code of "L276" or December 27, 1966.

When was your engine built??

Larry

[Rocco S.]

Re: c2 water pump

Larry, The casting date on the engine block is "C107" or March 10, 1967. The build date as stamped on the engine pad is "V0321HT" or March 21, 1967. Attached are photos of the water pump.

[Joe L.]

Re: c2 water pump

Rocco-----


The last character of the date code does not appear to be a "6" to me. It looks much more like an "8"

[Dick W.]

Re: c2 water pump

Rocco-----


The last character of the date code does not appear to be a "6" to me. It looks much more like an "8"

I share the same thoughts Joe

[Rocco S.]

Re: c2 water pump

All,

I agree that the date code appears to end with an "8". But I still believe (95%) that it is an imperfect "6" based on the following reasons.

1. Over the years I have seen casting dates that are not perfectly clear. Sometimes there is missing material and sometimes too much material. This means that a "9" could appear to be an "8" or a "6" to be an "8", or a "3" to be a "9", etc.

2. My car was purchased from the original owner and only shows 54,000 miles on the odometer. In addition, I have a complete maintenance history which includes all receipts for parts and service done at local Chevy dealerships. A review of all receipts from 1969 and 1970 show no record of a water pump change.

3. The actual water pump has the small (5/8") bypass pipe fitting and small hub with the single, small bolt pattern. I believe that later (1968?) water pumps with the same casting number had changed to a 3/4" pipe fitting and maybe had a hub with a dual bolt pattern.

I would appreciate hearing from the experts on my rational in thinking the water pump is original. I do think that the December 1966 date code may be a bit early for an engine assembled in March 1967. So I am open to your comments.

Thank You,
Rocco

[Joe L.]

Re: c2 water pump

All,

I agree that the date code appears to end with an "8". But I still believe (95%) that it is an imperfect "6" based on the following reasons.

1. Over the years I have seen casting dates that are not perfectly clear. Sometimes there is missing material and sometimes too much material. This means that a "9" could appear to be an "8" or a "6" to be an "8", or a "3" to be a "9", etc.

2. My car was purchased from the original owner and only shows 54,000 miles on the odometer. In addition, I have a complete maintenance history which includes all receipts for parts and service done at local Chevy dealerships. A review of all receipts from 1969 and 1970 show no record of a water pump change.

3. The actual water pump has the small (5/8") bypass pipe fitting and small hub with the single, small bolt pattern. I believe that later (1968?) water pumps with the same casting number had changed to a 3/4" pipe fitting and maybe had a hub with a dual bolt pattern.

I would appreciate hearing from the experts on my rational in thinking the water pump is original. I do think that the December 1966 date code may be a bit early for an engine assembled in March 1967. So I am open to your comments.

Thank You,
Rocco

Rocco------


I totally agree that casting dates can be extremely indistinct with "3", "6", "8", and "9" being easily confused. However, the last digit on your date code is about the clearest "8" I've seen. Could it be a "6"? Yes, it could but I highly doubt it.

Are you sure that the 5/8" by-pass fitting on this pump is not the result of a reducer being used? Installed cleverly, these can be hard to detect. In any event, pumps machined for 5/8" bypass fittings were manufactured after 1967 for SERVICE. Eventually, they were discontinued in favor of the 3/4" with a reducer supplied with SERVICE pumps for 5/8" applications.