Inline 6 pulleys

[Bunky]

I have a 67 GMC C15, with a 74 250 6 cylinder. I converted the truck to power steering but I'm not happy with the belt alignment. Is the alternator supposed to have a 2 groove pulley or is the power steering belt supposed to go directly to the pump?

[leegreen]

I believe: double groove crank, double groove water pump and single groove PS and Alt, Inner belt is crank-alt-water. Outer belt is crank-PS-water.

I have that driving on a '78 250 with a home brew PS bracket and it works, c10 donor had PS but the pump and bracket stayed in donor vehicle so I am not positive of setup

I have a spare '78 250 also C10 engine suffix with factory PS bracket but it came to me with no alt, water pump pulley or belts, so not positive of setup there either, but what I have does not contradict my description.

Your double groove PS pulley is unusual in my experience, is it original to engine?

[Bunky]

The double groove power steering pulley was on my pump so I used it. I also see that most power steering pumps are only single groove. Maybe that is where I should start

[leegreen]

Do you have a triple groove crank pulley or are you running PS off alt pulley? if it is a triple groove crank pulley with narrow spacing what is it off? I want a heavier pulley for a 292 swap but the 292 pulleys I have are weird groove spacing that wont work without building another PS bracket. I could use the 250 pulley I have but I think 292 like the extra weight

In the setup I am driving the belt on PS and outer grooves of water pump and crank passes right through the area of the outer groove of your alt pulley. I could find pictures, but since I made the PS bracket to work that way they may not be useful for you

[leegreen]

couple pictures here https://67-72chevytrucks.com/vboard/...d.php?t=564077

one shows PS pump driven only by waterpump, but I'd rather divide the loads across two belts where feasible

[leegreen]

https://67-72chevytrucks.com/vboard/...d.php?t=355833

[Bunky]

Originally Posted by leegreen

Do you have a triple groove crank pulley or are you running PS off alt pulley? if it is a triple groove crank pulley with narrow spacing what is it off? I want a heavier pulley for a 292 swap but the 292 pulleys I have are weird groove spacing that wont work without building another PS bracket. I could use the 250 pulley I have but I think 292 like the extra weight

In the setup I am driving the belt on PS and outer grooves of water pump and crank passes right through the area of the outer groove of your alt pulley. I could find pictures, but since I made the PS bracket to work that way they may not be useful for you

I do have a 3rd groove pulley on the engine but not using it. My alternator runs off the Crank then the water pump then the alternator, all on the inner groove. Right now the power steering is ran off the Crank then the water pump to the power steering pump back across the alternator pulley this is on the out groove. I do have the narrow grooved pulleys

I'm not against running the power steering off the water pump pulley

[leegreen]

if you have a single groove alternator pulley try that and run PS belt over crank, PS and waterpump. getting a straightedge in there to see how those grooves line up before making any changes may help.

Any idea what the 3 groove crank pulley came out of?

[Bunky]

Originally Posted by leegreen

if you have a single groove alternator pulley try that and run PS belt over crank, PS and waterpump. getting a straightedge in there to see how those grooves line up before making any changes may help.

Any idea what the 3 groove crank pulley came out of?

I'm going to try that single pulley next and see.

No I don't know it came that way. The numbers I have got off the block etc. comes back to a 74 Nova

[Bunky]

I changed the alternator pulley to a single pulley, the belt for the power steering would rub on the alternator pulley. So I removed the power steering pulley to compare to the single pulley I had to the double one I had it.

I think I need a different power steering pulley. I think I need a deeper single pulley.

By chance is there different snouts on the power steering pumps maybe a long and a short ?