Join Date: Nov 1999
Location: Central California, USA
Re: power steering weak
No, They are the same inside.
Two factors come into play, pressure and flow.
Low pressure affects low speed operation the most. If you lose boost at idle or low rpm's it's likely the pressure is too low.
If the system loses boost when you turn the steering wheel faster than normal, then it's lacking flow.
Stock pressures for a first gen are around 800 to 900 psi. Since all tires we use are wider, the load is higher and we now need 1100 psi or so.
There is a kit available to change the shim on your pressure valve. The most important part in the kit is a slice of aluminum tube that helps you safely clamp the valve in a vise so you can remove some shims and increase pressure.
As far as flow, you should drill out the flow orifice to around .140" ID. Drill it too large, and the system get's too jerky. Too small and it can't keep up with you during fast movements.
Check my web page for First Gen Camaro suspension info:
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67 RS 327 original owner. 1965 Lola T-70
Last edited by davidpozzi; Jun 4th, 17 at 11:17 AM.