SBC Pulleys?

[karl]

Can anyone explain why there are single, double and triple groove lower pulleys and single, double WP pulleys? Im sure AC, power steering and smog pumps play a part but im trying to make sense of it all. Thanks

[enaberif]

Originally Posted by karl

Can anyone explain why there are single, double and triple groove lower pulleys and single, double WP pulleys? Im sure AC, power steering and smog pumps play a part but im trying to make sense of it all. Thanks

Alternator = 1
Water Pump = 1/2
Power Steering = 1
Crank Pulley = 2/3

Alternator is always around water pump/crank
Power steering is crank
AC is water pump/crank

If you have no ac .. Crank pulley = 2
If you have ac .. Crank pulley = 3

[karl]

I am building a 77 C10 Heavy Half and it had a manual steering box and no ac. But did have a smog pump. I have a crank pulley with one groove that i think (dont remember for sure) came off this truck. I am adding power steering but will use the smog pump also, no ac. Do i need to get the double groove crank pulley? The spare steering pump that i have has a double groove pulley. Not sure what that is about?

[77 ChevySport]

[QUOTE=karl;7375770]I am building a 77 C10 Heavy Half and it had a manual steering box and no ac. But did have a smog pump.

karl: Depends on what engine is in the truck. Mine is a LS9(350) with HD emissions which means it "Did not" come with a smog pump or cat. converter.
Larry
P.S. Not sure about the non H.D. 350. BTW mine is also a non P/S+A/C truck.

[Dead Parrot]

I think the double grove PS pulley makes AC belt routing easier. The 2nd grove gives the AC belt a safe routing around the PS pump pulley.

[bmchevy1979]

The 2 groove powersteering pulleys are used with a.c. on my k5 I removed the double water pump pulley for a singe and used the 3 groove crank pulley and used two 36in belts on the powersteering pump then the alternator, water pump and in your case smog pump would run on the other groove