Tom454

I have a GM water pump with the following numbers on it:

T GM 2
3782808
L 28 6

What does all this mean?

I'm considering rebuilding it if it is correct for my C2.

Tom

JohnZ

That pump was on low-horse non-bypass 327 Corvettes for many years; yours was cast on December 28, 1966. It's correct for your car (unless it has reinforcing ribs on the driver's side) if you have a cast iron intake.

Tom454

Thanks John.

Your pic shows a 3782608. Is that relevant?

JohnZ

Yes, it is. There's no such thing as a 3782808 - it's 3782608.

Tom454

Yes... I thought that 8 might possibly be a 6.

But then I came up with this:

http://www.ebay.com/sch/i.html?_trks...at=0&_from=R40

I'll go sandblast the housing to see it more clearly.

Thanks again.

JohnZ

He can't read (or type) casting numbers - ALL of the "808" pumps in that auction are "608" pumps. There is no such thing as an "808" pump.

Tom454

Here are some pics of the pump I have...

Tom454

Here is the end 8...

The 6/8 in question...

The entire number...

Tom454

Here are the last 3 digits after wire wheeling... kinda looks like a 6 now...

Here's one off ebay...

Mike67nv

The pic below is a 608 I bought from Bill Mock for my ’67, dated D57. This one hasn’t seen much corrosion and the casting number font is larger, but you can see there isn’t much difference between the 6 and 8. The telling sign is the width of the arch on the top of the 6, it’s a wider arch than on the 8.

Be careful sandblasting your pump, you may remove even more of the casting number.

Tom454

If you look closely at the left center of this one...

http://i58.tinypic.com/14jask9.jpg

I believe the left vertical is solid, while the right vertical center indents.
That would be the sign for me that it's a 6.

I'm good with it now as a "6".
Thanks JohnZ for the nudge in the right direction.