Re: L89 Head Rocker Nut Question
The Poly Lok nuts were available aftermarket even back in the '60s. I had them on my Ram Air Firebird in '68. They may have been included in the Royal Bobcat kit that was installed. The ends of the rocker studs should be ground flat and square so that the locking set screw bites in properly. The screw is all the keeps the nut from backing off.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now. 
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