63 water pump bypass fitting

[Michael G.]

Is the bypass fitting shown here correct for a 63 L84 engine? It doesn't look anything like the repops.

Thanks,

[Michael G.]

Re: 63 water pump bypass fitting

The pic didn't go....here it is...

[Michael G.]

Re: 63 water pump bypass fitting

The one in the pic is most likely original and matches the fitting shown on pages 134 &140 of Nolans book, but does not match the one shown in the Judging Guide (the hex is obviously shorter in the JG ). Were two different fittings used?

[Irby G.]

Re: 63 water pump bypass fitting

i Mike,
Not exactly sure here but I think that there is suppose to be a diamond shape embossing running up and down one of the sides with a 'P' on the inside of each diamond.~ 4 or 5 diamonds.
Irby

[Michael G.]

Re: 63 water pump bypass fitting

Thanks Irby,

My concern is more with the length of the hex than the markings, although I need to look at the other side of the one in the pic to see if it has any markings.

Does anyone have an untouched original with the longer hex body as shown?

Thanks,

[Jack H.]

Re: 63 water pump bypass fitting

I can't give you dimensions, because I sold this one. I pulled it off of a '609 water pump core I bought at a swap meet and cleaned/replated it. The outlet nipple was OBVIOUSLY deteriorated by rust over the years...

[Wayne M.]

Re: 63 water pump bypass fitting

My concern is more with the length of the hex than the markings, although I need to look at the other side of the one in the pic to see if it has any markings. Does anyone have an untouched original with the longer hex body as shown?...,

You're not getting many bites, probably because these long hex fittings are rare. As to the dimension, attached thumbnail shows the shorter version, which is exactly 7/8" long [22.0mm], measured along the center of the "diamond P's". From those pics in Noland's Vol2, looks like the extra length was due to a higher hex; seems that the outlet is at the same location, regardless. Notice how the outlet neck tilts downward. Believe this is normal (comments welcome).

[John D.]

Re: 63 water pump bypass fitting

Michael, Unfortanetly my 63 is being used for a shelve at the moment as I am cleaning up my pig sty.
You fitting is bottomed out in the pump. Several threads should be showing. At least 4 threads showing is typical.
When installed the fitting, clamps and hose were covered quite a bit with orange. JD

[Bob J.]

Re: 63 water pump bypass fitting

That tall fitting looks a lot like a 61-62 fitting to me. Bob

[Jack H.]

Re: 63 water pump bypass fitting

I think there was more than one supplier of this nipple that generated slight differences in emboss...

[Michael G.]

Re: 63 water pump bypass fitting

Thanks for the comments John, the fitting below is on my other car, so my paint skills going to get tested again.

The pictures in Noland's book are of prototype engines so its possible this is a '62 part used for prototype and on early engines.

That fitting made it through two Regionals and a National Top Flight without a deduction, though, so somebody once thought it was good.

The question is, as I clean up this engine, if the fitting is possibly original, am I going to have to replace it just to meet the modern requirements of the JG?

Thanks,

[Michael G.]

Re: 63 water pump bypass fitting

Jack & Wayne,

Thanks for posting those pics. The "Diamond/P" markings on your old fittings are different than the ones on the current Paragon repop. Looks like I'll have to find a real fitting somewhere or EDM my own markings.

[Jack H.]

Re: 63 water pump bypass fitting

No problema! BTW, I've also seen equivalent fittings with a repeated <CP> emboss pattern. Together, that leads me to believe there was more than one source of supply...

In those days, getting a 'sole source' approval on a GM production purchased part was VIRTUALLY IMPOSSIBLE!

Plus, it's a double sided sword when you approve/tool multiple sources for a given part. Unless you give each supplier SOME order volume, don't bet on them to be there when the chips fall and you need them!!!

My guess is that's why we see alternate headmarks on this/that fastener as well as different supplier ID's on things like TS flashers, Etc...

[Michael G.]

Re: 63 water pump bypass fitting

I'm going back a year on this one...

Below, I've attached 3 pics: one is of the fitting on my car, the other two are supposedly original 63 bypass fittings. You should note that the one on my car matches the pics of originals from earlier in this thread, while the other two match variations described in the JG.

The one on my car is a reproduction specifically made to match the ones earlier in this thread. The problem is, I've been told by a very respected judge (who's probably reading this now) that this marking is not correct.

If I'm going to go to all the trouble to drain the anti-freeze, try to get the hose off unscathed, and probably repaint the fitting, then it'd be a really good idea if I knew what the heck I was doing (for a change) If anyone really knows which of these (or maybe none) to put on my car, you'd make my day...

Any help would be greatly apreciated....

[Michael H.]

Re: 63 water pump bypass fitting

I'm going back a year on this one...

....

Bob Jorjorian was right in his post from last year. The fitting appears to be a taller 61-62 fitting.
If you have an early production car, and you believe the tall/61-62 fitting is original, I would use it. I think it's probably the original too.

I have several factory photos of new early production and pilot line engines that have the taller 61-62 style fitting.