From memory, yes, it is through the side plates. About 40years since I worked on a Holden Red Motor & can't remember the procedure for adjusting the rockers. Know you had to tighten them down a certain amount, then crank the motor over for the lifters to fill or bleed off / fill. once started adjust them until they stopped rattling then tighten them down 3/4turn, I think. "O" it's a bugger getting old.
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