Water Pumps......CW vs CCW

[Doppleganger]

IIRC the older drive belt driven motors had a water pump that spun one way, and the serp belt driven pumps spun the opposite? Is there a physical difference (maybe a cast number or design) that differentiates the two?

My truck is an 85, but the motor is a '97. Its going to be serpentine belt driven. The guy who built it put a new pump on it - he's kind of hard to get ahold of and not 100% sure he'd remember anyways - just want to know I have the correct water pump.

THX

 

[Vbb199]

Reverse rotation for serpentine

Standard rotation for v belt I believe

At least in most cases.

 

[bucket]

The impeller is the biggest difference.

Externally, the standard rotation pump has an accessory mounting lug on the driver's side, for the v-belt style power steering pump. The counterclockwise rotation pump does not have the accessory lug and will interfere with most (or all?) factory serpentine style accessory brackets if it did.

 

[bucket]

Shown here is a standard rotation pump, with accessory mounting lug that is interfering with a 'Vortec' style bracket. The picture is kind of crappy.

You must be registered for see images attach

 

[Doppleganger]

EXACTLY what I needed! Thanks much!

Best pic I could find.....I will arse-ume that since the vortec AC bracket fits fine, I have the serp style pump?

You must be registered for see images attach

 

[bucket]

EXACTLY what I needed! Thanks much!

Best pic I could find.....I will arse-ume that since the vortec AC bracket fits fine, I have the serp style pump?

You must be registered for see images attach

Yep, that's the correct vortec style pump too. Threaded stub for a cooling fan hub, larger bolt pattern for the pulley, and two formed heater hose outlets. The extra outlet gets plumbed to the front water crossover in the intake, since the water bypass is not made into the block.

 

[gmctrucks]

Since we’re talking about water pumps I put a high volume pump on my 93 truck it does put out more water and it can be rebuilt but it’s lasted a LONG time.

 

[Vbb199]

Since we’re talking about water pumps I put a high volume pump on my 93 truck it does put out more water and it can be rebuilt but it’s lasted a LONG time.

I couldn't help but notice you joined in 2011, and this is your first post lol

 

[scrap--metal]

I couldn't help but notice you joined in 2011, and this is your first post lol

Lol. Welcome @gmctrucks. Don't be a stranger.

Also, do yourself a favor and get a square body. Or two!