Thread: water pump pulleys

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Are there differences in SBC and BBC water pumps pulleys and if so are there
any advantages or disadvantages? thanks

Some use a small water pump pulley to pump more coolant. V8 Monza's had the smallest at 5.25" (I think) and they needed it. Monza's use a short water pump.

Some HiPo pulleys are a little deeper to help stop the belt from jumping.

SB Corvette water pumps have a larger impeller shaft so they use a pulley with a larger pilot (3/4" vs 5/8") hole.

no sbc and bbc may work old short pump water pulley only. crank pully will not . it will bolt up but the sbc will not center on the .bbc hub id and in time bust off .newer sbc and bbc long pump are not the same and will not fit .smaller pulley for the water pump may not do any thing for you if the intake is alum you run a hi flow pump you may just push it threw to fast. start with the right bbc pulleys for starters

Originally Posted by pat mccarthy

no sbc and bbc may work old short pump water pulley only. crank pully will not . it will bolt up but the sbc will not center on the .bbc hub id and in time bust off .newer sbc and bbc long pump are not the same and will not fit .smaller pulley for the water pump may not do any thing for you if the intake is alum you run a hi flow pump you may just push it threw to fast. start with the right bbc pulleys for starters

I've had much better success with a stock pump and Monza pulleys then with expensive HiPo water pumps and common pulleys in my Vega's. The pulleys help a LOT in slow traffic and at an idle. They're are a ton of variables when it comes to cooling as we all know.

Also, I didn't read the OP's post correctly. I didn't realize he was talking about swapping BB and SB pulleys...my bad.

Originally Posted by djv8ga

I've had much better success with a stock pump and Monza pulleys then with expensive HiPo water pumps and common pulleys in my Vega's. The pulleys help a LOT in slow traffic and at an idle. They're are a ton of variables when it comes to cooling as we all know.

Also, I didn't read the OP's post correctly. I didn't realize he was talking about swapping BB and SB pulleys...my bad.

well yep.. you have better luck with a stock pump in a bbc hi hp big cid engine if so i am all ears i been playing with big cid bbc for some time now and the hi flows seam to help some but it water speed and theres many variables just like you said

Originally Posted by pat mccarthy

well yep.. you have better luck with a stock pump in a bbc hi hp big cid engine if so i am all ears i been playing with big cid bbc for some time now and the hi flows seam to help some

AAAHHH....no. You're way out of my league with those monsters. I have one h*$$ of a time with the little ones when it comes to cooling. I'm starting to think a huge radiator in the hatch area might be the way to go.

On a side note, It's just too darn hot out here.

I just wanted to let anyone here that I work for Evans cooling systems. I help hot rod/street rod/ and anything else making power to give them better soultions for helping a car to cool down.
I help anyone with a problem, even if they are using a 50/50 mix. I also DO NOT try to sell anything. I just try to point guys in the right direction for cooling help. So if you have a heat problem with your car , just let me know.
I will ask lots of questions to get info needed to help diagnose.
It's a help if you tell me kind of car, HP it makes, kind of radiator(aluminum or copper/brass) if it's aluminum , how big are the inside tube widths. What kind of pump? electric or belt driven? overdrive on the pulleys? smaller pump, larger crank? what kind of fan? belt or electric.If belt is it shrouded?

thanks guys for info, the reason I brought this up is that I am running the same water
pump pulley on the BB that I was on a SBC....Someone told me there were differences
in diameters of the pulleys...I will be having a 8850 hi flow Edlebrock in a few days for
the BBC