Water Pump Pulley

[custodian]

Is the water pump pulley for an 85 C10 with a SBC and AC a 2 groove or 3 groove?

 

[1987 GMC Jimmy]

It should have come with a three groove pulley, two v belts on the front and rear and a mini serp in the middle for the alternator. If you’re getting rid of the air injection, you don’t need the front groove, but it’s hardly noticeable if you keep the stock pulley and delete the AIR.

 

[custodian]

It should have come with a three groove pulley, two v belts on the front and rear and a mini serp in the middle for the alternator. If you’re getting rid of the air injection, you don’t need the front groove, but it’s hardly noticeable if you keep the stock pulley and delete the AIR.

I'm changing from a 6.2 diesel to a 350 . Have a few pulleys and was just trying to make sure I put the right pulley on the water pump. The harmonic balancer pulley is a 3 grove. It will have power steering and AC.

 

[1987 GMC Jimmy]

Gotcha. If you’re not using a smog pump then, you can use a two or three groove water pump pulley. If you have to have a smog pump to pass emissions, then three it’s gotta be.

 

[custodian]

Gotcha. If you’re not using a smog pump then, you can use a two or three groove water pump pulley. If you have to have a smog pump to pass emissions, then three it’s gotta be.

In NC, if the vehicle is 35 years old at the date of manufacturing, it doesn't have to be inspected for anything.