My son has a 66 Mustang - stock 289 - a few years back he 'freshened' up the motor - recon heads, new cam & lifters, re-ring, oil pump as well as rebuilding the auto trans - been running ok until the other week he had a miss fire and traced it to a bent exhaust valve pushrod, a new set of push rods installed and the same issue happened a few days later, on looking closer he noticed the rocker stud was badly worn on the offending valve/pushrod/rocker assembly. On checking other rocker studs it looks as if all of the exhaust studs have wear - some worse than others - at the point where the rocker contacts it - looks like only option is to at least replace all of the exhaust rocker studs and maybe the inlet studs while he is at it with either screw-in studs or like the original, push/friction fit studs. He isn't keen on screw in studs as he is convinced that the heads will have to be removed to do this so is looking into push fit studs, I have tried to talk him into screw in studs but he is paranoid about some swarfe getting into the water jacket. He removed one of the studs (and quickly found the hole went right through to the water jacket) and found it was relatively easy to hammer it back in, was it easy to do because it was the old stud, will new studs be relatively easy to hammer in, as well ?


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