I presume you have hydrolic lifters? you list b cam.
If so roll the engine over till the lifter is on base of cam no lift. Turn pushrod by fingers and tighten rocker nut until pushrod starts to get tension. Add 1/2 to 3/4 turn more (this sets the lash). Tighten the jamb for the adjuster nut. Repeat for each lifter/rocker combo.
I have Edelebrock heads and crane cam adjustable roller rockers with posi locks. It seems that I am only catching about five threads and the posi locks dissapear when tightend. Is this normal? I figure that they should go half way on the stud at least.
It could be a case of having too long a push rod. Since you have switch heads, I'd call Edelbrock and ask them what they recommend the length should be. Make sure you give them all the details you know about your engine. Deck height, whether or not the heads have been milled, Cam, Type of lifters, and current length of push rods. Should give them enough information to trouble shoot your problem.
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