First of all you have to make sure that all your steering components are intact and in good order. Things like loose/worn ball joints, tie rod ends, swing arm bush's can all effect the handling of your car especially at high speed. You will also need to check your rear swing arm bush's. Excessive rear end wear will give the appearance or feel of loose steering. A warn ram or faulty power head will mean you are forever chasing the steering so to speak.
Also wheel alignment is critical. That’s on all 4 wheels. If your, as an example, toe in or camber is off your car can be very twitchy.
If all of the above is OK and you still feel that she is a bit twitchy you can only increase the pump pulley size. I have never done this so I can not advise you on pulley sizes.
Having said that this type of steering system was never the best in my opinion. I replaced the whole system in my beast with a Rack N Pinion unit. Not Cheap
If it was my beast I would be getting it checked over by a mechanic who is quite familiar with vettes to give you a starting point then take it from there.
If your Sydney based we can recommend a few good operators.
Cam
