1968 Z28 water pump bypass fitting

[z28z11]

I've searched the threads and never found a "definitive" answer - is the hex style fitting or the square style proper for a June '68 Z28 326 water pump bypass hose fitting ? I have a 1/2" NPT GM NOS square style fitting, but afraid it was released as a replacement or maybe was used on L79 motors prior to '67-'68 MO applications. Opinions ?

Regards,
Steve

[luv2sixty9]

Hex

[68camaroz28]

Hex

X2 on hex but limited originals observed but believe that to be what is considered technically correct. Here is an original with stampings.

[z28z11]

Here's what threw me - correct part number in my early 70's part book, 3829819, NOS, but apparently superseded the hex with the square. Disappointing due to a good looking part !

Thanks for the replies and the confirmation -

Steve

[169INDY]

Hex

[cook_dw]

https://www.ebay.com/itm/65-68-CAMARO-CORVETTE-CHEVELLE-CHEVY-II-NOVA-WATER-PUMP-BYPASS-FITTING-NIPPLE/202187303827?fits=Year%3A1968%7CModel%3ACamaro&hash=item2f134d6b93:g:e5YAAOSwM~taWxKS:sc:USPSFirstClass!37087!US!-1

[dannystarr]

Hex has a better visual..    Gotta be SOMEONE here with an extra original one for you. Let me go look in my stuff... Danny

[dannystarr]

I found one.. It's a little tired. Is this correct? Has different markings, but maybe a different vendor?  Danny

[dannystarr]

more

[dutch]

Sort of 'off topic' but sort of not..  What really does a bypass fitting do other than bypass coolant directly to the intake and avoid the heater core hoses and circuit?
Do they really serve great and needed purpose(s) for engines and if so why were they not installed on all engines and not just the HiPerf versions like the Z's and L78's? Was there something to do with the higher rpm's that these engines were capable of that make their installation a necessity verses regular lower rpm versions.. there should be some logical reason I'm not aware of?
I do know GM made many other good performance engines that rev'd up well that didn't seem to need such an arrangement so..?

[z28z11]

more

I found one.. It's a little tired. Is this correct? Has different markings, but maybe a different vendor?  Danny

Looks like it to me. The two (or more) vendors for any particular part is perfectly plausible - we've noted that fact on many other parts.

This one appears to have been painted at one point in time - wonder if that was original ? By the looks of the hose end, it was in service for a long time - you don't get pitting like that on a plated steel part in a couple of month's exposure.

Regards,
Steve

[68camaroz28]

more

I found one.. It's a little tired. Is this correct? Has different markings, but maybe a different vendor?  Danny

Looks like it to me. The two (or more) vendors for any particular part is perfectly plausible - we've noted that fact on many other parts.

This one appears to have been painted at one point in time - wonder if that was original ? By the looks of the hose end, it was in service for a long time - you don't get pitting like that on a plated steel part in a couple of month's exposure.

Regards,
Steve

That coupling, hose and clamps were on z/28 engine when painted.

[luv2sixty9]

Here is yet another one, making it (3) different markings. I also have two NOS ones with no markings at all.

Mine has what appears to be "CP" within the diamonds and a circle around the diamond.

[Tx-Z 302]

I'm in the market for one of these!

[dannystarr]

Z28Z11, you still need one of these? Maybe might be better to start off with a fresh new one. Unless your car is ALL numbers matching/survivor. Then you surely don't want a new one    Danny