67 BB Camaro 3 groove cast crank pulley pic
 

Recently Anthony has had some two and three groove 67 BB cast iron crank pulleys for sale and I ask him if he’d like me to post this picture of my three groove pulley set up on my 67 car.
Some people don’t understand why some cars use a two groove and others a three groove. Hope this picture is helpful to someone.

I've always understood it to be alt, water pump, power steering if using all 3 grooves on the balancer pulley are used...

From the block out,
1st groove- Alt n water pump
Center groove- water pump only
Third groove- power steering

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For "Factory Belt Routing" See your:
AIM (1967/1968/1969)
UPC 6

3 groove is for power steering

don't forget there was also smog on LA cars

Was the power steering groove lined up with the smog pulley?

I’ll guess it’s the center groove.

So, la smog cars without power steering got 2 groove and with got three groove. I wonder if la smog cars without power steering still got 3 groove and it wasn’t used or got just the 2 groove? Does anyone with an original bb car with smog and no power steering confirm if they have 2 groove or 3 groove?