I have been using the cheaper 87 grade..as per my buddies suggestion. id rather use the 92/93--but they claim the higher grade will eventually damage the rings etc? who knows? is it possible that the higher grade could give me more power/torque? i do not hear any valve knock with the 87 grade. any forum feedback is always appreciated.

HAPPY MOTORING

That's appropriate. If you're fortunate enough to be able to buy gasoline that does not contain ethanol, and the price isn't ridiculous, buy that. Otherwise just keep buying regular unleaded.
Why, you like wasting money? There is no reason, need, or benefit to running high-test gasoline in a stock or near-stock slant-6 engine.
That's not true. All it will do is drain money out of your wallet unnecessarily.
People who understand how this stuff works—they know. And…now you know!
No.
Gasoline grade does not influence valve noise. There is nothing such as "valve knock". Valve noise is influenced by tappet clearance -- if the valves make noise, you need to do a valve adjustment. Gasoline of too low an octane rating can cause ping/detonation/spark knock — and so can improper ignition timing, a faulty distributor, vacuum leaks, restricted exhaust flow, too-lean fuel mixture, and improper spark plugs.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Buy the cheap gas and be glad of it....

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Yeah....Im the one who destroyed this rare, vintage automobile.....

This:

Is just a band aid to cover up...

This:
Which eventually leads to a whole lot of this:
When the engine finally calls it quits and you have to rebuild it after putting a hole in a piston, instead of taking the time to tune it up and making sure everything is running right...

Which allows you to save money so later you can upgrade the engine when you are ready for it.

DI: Full circle:
DI may be suggesting, that once you build a high performance slant you can go back on the high test as such an engine most likely will require it. LOL

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC