What size is the water pump on a small block Chevy?

Water Pump Size for Small Block Chevy
The size of the water pump on a small block Chevy can vary depending on whether it is a short or long water pump. For a long water pump, the measurements typically come out to 7 inches for the small block long pump. Additionally, the diameter of the water pump snout for most GM water pumps used the 5/8-inch (.625-inch) diameter water pump shaft and pilot stub for the fixed or clutch fan from the factory.
When determining the type of water pump, it’s important to consider the measurements from the mounting flange to the hub surface of the pump. A long water pump will provide a finger’s width of space between the pump and the timing cover, while a short water pump will have a much larger gap between the pump and the block assembly, to the extent that you can almost fit your hand in between the two.
In summary, for a small block Chevy, the long water pump measures 7 inches and uses a 5/8-inch diameter water pump shaft and pilot stub for the fixed or clutch fan from the factory.
I hope this information helps! If you have any more questions or need further assistance, feel free to ask.

What’s the difference between a short water pump and a long water pump?

On short water pumps, you most likely wouldn’t be able to stick a finger between the back of the water pump and the front of the timing chain cover. With a long water pump, you will be able to. In summary, if there’s about a 1″ gap then it’s long, if it’s right up against the timing chain cover then it’s short.

How tall is a SBC water pump?

5-5/8-inch
Small block “short” pumps measure 5-5/8-inch (5.625-inch). The Corvette used its own version of a short water pump from 1971-1982 due to engine compartment clearance issues with a special 5.795-inch height, so be aware of those as well. Big block “short” pumps measure in at 5-3/4-inch (5.750-inch).

Are all Chevy 350 water pumps the same?

And to answer your initial question, NO all water pumps are not the same. You can buy ‘reverse flow’ pumps, hi-volume pumps, etc. etc. But, unless you intend to race this vehicle, just put a stock water pump back on….IF you need one.

What is the sizing of the pump?

Pump sizing involves matching the flow and pressure rating of a pump with the flowrate and pressure required for the process. The mass flowrate of the system is established on the process flow diagram by the mass balance.

What happens if you oversize a water pump?

Oversized pumps generate excess system flow and with throttling cause higher backpressures, this will in turn prematurely wear out bearings and seals.

Is big block Chevy small block Chevy water pump the same?

One of the questions we commonly get is what water pump is right for my Chevy V8, whether it be a small block or big block Chevy. The reason for this is Chevy developed two different types of water pumps for these engines: a short-type and a long-type.

How long is a SBC water pump?

A more accurate way is to measure the shaft, a SBC long water pump shaft is 7″ and a short is 5 5/8″ — a BBC long water pump shaft is 7 1/4″ and a short is 5 3/4″.

Are all small block Chevy water pumps the same?

When it comes to both small and big block Chevy V8 engines, there are essentially two different types of Chevy water pumps—a long style and a short style.

How do I know if my SBC water pump is long or short?

Alone one exception to all of this are Corvette water pumps. These pumps have dimensions brackets pulley bolt patterns.

How do you determine the size of a water pump?

When considering the pump you might need, you need to try to work out what your water demand will be. You will count the number of taps, water using appliances, irrigation and any other water use that might be used at any one time. This will determine the total litres per minute you might need.