Waterpump?

[emil77]

Hi guys,


I need a new water pump for my '72 C20. I'm confused on some areas. One website shows options for a "long" or a "short" water pump. When I called Autozone, they have it in stock, but didn't know if it's short or long. Also, what size are the bolts that hold the water pump? I will be replacing those also.

[Rooster's 67]

if the back of the water pump touches the timing cover on the front of the motor it is short if there is a space it is long, 72 should be a short pump.

[emil77]

Cool, what about the bolts?

[stsalvage]

most of these trucks had the small 283--327 water pumps Cus of the lining up of the pulleys.That's only if no body went in there and started changing pulleys Look and see if any of my pictures help .Now there not the best pictures but the last one is from a 1972 nova with a 307 that is a tall water pump If you have AC it might change it but on my 1971 Cheyenne it still has the small water pump But on that 307 look at the pulleys are they simler to what you have .or do you just have a single pulley on the water pump and on the crank you will have 2 single pulleys

[stsalvage]

Originally Posted by Rooster's 67

if the back of the water pump touches the timing cover on the front of the motor it is short if there is a space it is long, 72 should be a long.

Not always on my 1971 chevy 1/2 ton Cheyenne it has AC and it has the small water pump and so is my 1972 chevy 3/4 ton deluxe.It has a lot to do with the brackets they used on the trucks to line up the belts.Me i prefer the 327 Small water pump the brackets and the pulleys line up so sweet.And it depends on the long throw Alternator bracket on the driver side or used the small Throw alternator arm on the Car's on the driver side.it can get quit confusing.And you can tear up belts in a heart beat

[emil77]

Here are some pics of my engine:

[cdowns]

a foolproff way to get the correct pump the first time is to take the old one with you when going to the store

[tommys69/454]

a foolproff way to get the correct pump the first time is to take the old one with you when going to the store

i believe they will want a core anyways, this beats two trips or three if you have the wrong one.

[emil77]

Great, thanks for the info. They don't need a core, so I will try to take the old one to match it up.
Anybody know about the bolts?

[leddzepp]

A factory 72 truck should have the short water pump. Is your alternator on the driver or passenger side?

[stsalvage]

Just like i was saying I took more pictures to help you on your way The bib i talk about on heater core units only have it on the water pump and the intake Now the Ac modals have one on the intake and none on the water pump your radiator will be the spot where you get your hot water from

[emil77]

Originally Posted by leddzepp

A factory 72 truck should have the short water pump. Is your alternator on the driver or passenger side?

The alternator is on the drivers side.

[eightbanger]

Waterpump bolts are 2" long...
http://www.summitracing.com/parts/AR...3202/?rtype=10

[emil77]

Originally Posted by eightbanger

Waterpump bolts are 2" long...
http://www.summitracing.com/parts/AR...3202/?rtype=10

Thank You.

[stich626]

he has spacers on a short pump..
he should get a long pump bolts will be longer than 2" on a long

[eightbanger]

What spacers? according to summit same bolt short or long pump.

[emil77]

You guys are confusing me! Haha. Some say long pump, some say short, which one should I get???

[eightbanger]

Look at the illustration I posted it gives the sizes of the two types run a tape along side yours and see...it's either 5 5/8" short or 7" long. Your year truck should have short.

[GASoline71]

All of the 67-72 trucks with a Small Block Chevy 283 thru 350 had short water pumps. You can get new water pump bolt kits either online or at an auto parts store. Just tell them you have a short water pump.

Gary

[leddzepp]

You have a short water pump.

[emil77]

Thank you, thank you!

[Pop's C-10]

Why do you need new bolts? tha ole ones should be fine.

[stich626]

looking at his pic of the water pump on his engine there are spacers between the pump and block (iirc moroso made these)
he can run the short pump and spacers but thats 2 extra gaskets and 2 more places to leak.. or a long and toss the spacers
look at his pic's and the part withing the black marker..
if he runs the short pump without the spacers nothings going to line up,

[emil77]

Originally Posted by Pop's C-10

Why do you need new bolts? tha ole ones should be fine.

I am weird like that, I like to replace everything and I'm missing one of the bolts.

[emil77]

Originally Posted by stich626

looking at his pic of the water pump on his engine there are spacers between the pump and block (iirc moroso made these)
he can run the short pump and spacers but thats 2 extra gaskets and 2 more places to leak.. or a long and toss the spacers
look at his pic's and the part withing the black marker..
if he runs the short pump without the spacers nothings going to line up,

Will a better pic of the water pump help clear up the short vs long issue?