L63-64 Water Pump

[Loren L.]

What is the current official answer for the casting # of the water pump on mid-year '63 & '64 SHP and FI engines? Thanks.

[Edward J.]

Re: L63-64 Water Pump

I know what most here on the discussion board would like to say as I am sure you already know. The 326 pumps are still in a lot of 63s.the judges will likely let lt go as the JM still spells this out.

[Harry S.]

Re: L63-64 Water Pump

What is the current official answer for the casting # of the water pump on mid-year '63 & '64 SHP and FI engines? Thanks.

The pump has been a debate for a long time. I believe, as many other do, that the only pump for a SHP 63 is an undated 609 pump. The current JG needs an update.

[Dan H.]

Re: L63-64 Water Pump

Seems to me I remember that 609 pumps were good for most of 63 until late, then the 175 pump came into use all the way through 64, when the 326 pump dwgs show it as a 65 pump, and probably as a service replacement for hard run 63/64 SHP and FI cars. I have a nice picture from famous water pump guru of low mileage 64 FI car with a 175 pump on it. The 175 used on the line are much different from the later service 175 pumps which appear to be a high bred cross of a 609 and 326 pump but with a larger bypass hole on top. Nolands C2 book on page 227 shows a prototype 64 SHP engine with a 175 pump not a 326 pump, which was developed later for 65 cars. Good luck Loren.

[Loren L.]

Re: L63-64 Water Pump

I asked because I've recently been asked (twice) by guys with '63 SHP/FI cars; my response of "609" was greeted to arm-waving and finger pointing at the manual as well as a "reading" of the manual over the phone - I thought I could secure an answer here about how it was handled on the judging field. The consensus seems to be "Whatever Makes You Feel Good" or its equivalency. Too bad.

[Dan H.]

Re: L63-64 Water Pump

I guess if you're not sure, let it pass ? Don't want anybody loosing money because they didn't research what was originally installed ?

[Joe R.]

Re: L63-64 Water Pump

Well back in the day a 609 was what was on the 63's 340hp and 375hp's. Why don't you check with Bill Mock and get the real story!

JR

[Alan D.]

Re: L63-64 Water Pump

Dan given you a god general description and Joe gave you the go to person.
Note the 326 pump factory print is dated 5-18-65

[Dan H.]

Re: L63-64 Water Pump

Bill Mock has many pictures and info on the history of these pumps, it should be documented.

[Loren L.]

Re: L63-64 Water Pump

I'm well aware of the 1965 print of the 326 print. Having owned a '63 in 1964, I'm also aware of what I saw with my own eyes. I'm just amazed that after 8 years after its copyright date, the issue has not been resolved so that an owner can know what to expect. Dan may be accurate when he says "..let it pass.." is the attitude....why not just pretend the reinforcement, pulley, fan clutch and fan are just suspended in mid-air?

[William M.]

Re: L63-64 Water Pump

Loren,
NCRS has been beating this dead horse issue for years. I have always said that the 3782609 was used on 1963 Corvette 340hp327 engines and 360hp327 engines and the 3839175 water pump was used on 1964 Corvette 365hp327 engines and 375hp327 engines. The 3859326 water pump not used on any 1964.The sequence of the water pump casting numbers bears this out. Michael Hanson has the same opinion as me. Mike has the blueprint for the 3859326 by the Gray Iron Foundry dated May 1964. Go to the "Advanced Search" box and type in "3839175" and you will see the discussion over the years. I have been rebuilding Corvette water pumps since 1978 and have rebuilt a number for original owner 1964 Corvettes with the solid lifter engine and they all had the 3839175 water pump. For years NCRS was going to change the NCRS Judging Manual, but to date nothing has been changed. Probably because there are too many 1964 Corvettes with 3859326 water pumps on them.
Bill Mock #93

[Edward J.]

Re: L63-64 Water Pump

Bill why were there undated 326 pumps. GM had dated pumps starting in 64?

[William M.]

Re: L63-64 Water Pump

Edward,
The 3859326(Saginaw) water pumps for the HP 327 engines with the 1/2" NPT bypass were only GM1,GM2,GM3 and GM4 and were not dated until late October 1965( I have seen two of them). The earliest date that I have had was a K 5 5(November 5,1965). Early 1966 350hp327 engines would have an undated 3859326 until dating started(GM5 and up) and the rest of the 1966 model year you would see either a undated or dated 3859326 water pump. The 3782608(Saginaw) water water pump used on 250hp and 300hp engines was undated up to March 1964. The 3782608 water pumps were also cast at the Tonawanda engine plant for Tonawanda("T") engines and those were all dated. No 3859326 water pumps were cast at the Tonawanda plant.
Bill Mock #93

[Tracy C.]

Re: L63-64 Water Pump

.......... I'm just amazed that after 8 years after its copyright date, the issue has not been resolved so that an owner can know what to expect...........

"amazed" is not a word I would use to describe my feelings on the topic....

[Michael J.]

Re: L63-64 Water Pump

Yes, this subject has been beat to death over the years, but refuses to die........