I do not know why but I had one rocker that would keep backing off so I took loc-tite and put it on them and no more problems.
And yes I tightened the **** out of them.
Comp cams 1.70 roller rockers
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James Cox
nochevy@hotmail.com
1991 Mustang LX
12.565 @109.38mph 1.764 60ft