Sorry to be a bother but I'm still learning about these cars and I understand there's a keyway, press fit, and press fit metric pump types. How would I know which one I have? It's an integral pump and reservoir unit. It's roundish, almost bottleneck, and not like the taller, more upright one that was on my '70 Chevelle. The pulley looks like about 6" dia and appears to be held on by a nut. I believe it's the right one for my car since the exact same one is shown in Rick's catalog. But if I decide to replace the pulley with a March or some other type I'm not sure which one it is. TIA!

[ 11-24-2004, 06:45 PM: Message edited by: bigdawginva ]

It's an early style, proper for your model.
I think the press on pulley and squareish reservoir came out in 73 or 74.
David

All GM car and truck pumps converted to the interference fit pulley in 1975. The pump driveshaft ends flush with the pulley hub. If you look at the end of the pump driveshaft you will see some splines and a female 3/8-16 UNC thread down inside the end of the pump driveshaft. This is for the special tools that are required to install and remove that type pulley.

All of the older pumps (before the 1975 model year) have a 9/16-18 UNF male thread on the end on the driveshaft with a woodruff key and a large nut holding the pulley in place. This pulley system did not require special tools other than a wrench. (Although rust can also make removal a chore.) Regardless of the type of pulley, NEVER pound on the end of the driveshaft. You can break parts inside the pump.

Most GM car and truck steering systems converted to metric attachments the 1980 model year. Power steering hose connections and the tapped holes in the pump housing as well as the studs on the rear of the pump converted to metric. The pump reservoirs did not change since the studs and discharge fitting would hold the reservoir in place regardless of the thread. I do not know the timing for any Camaro reservoir changes. But it would not necessarily have any relationship to the metric conversion.

Interesting point: This has nothing to do with pumps. The tapped holes in the recirculating ball steering gears (where they attached to the frame) never converted to metric. They are still female 7/16-14 UNC threads today.

Have a Happy Turkey Day!
Jim

Thanks for all the info. Good to know I have a keyway pulley so I can swap it myself.