Tig
I had a 360 Duster last year with the same rockers and had a similar problem with one coming loose. The guy that bought the car off me, is thinking of replacing them.
I wouldn't want to use them with 400 hp.
cheers Mick


69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200#
best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft
best 60ft 1.36