I know that this is a stupid question, but here goes.

I have installed crane roller rockers on my stock 502's. What is the proper procedure to adjust these things?

Any help will be appreciated.

Thanks,
Dail

I recommend that you check out a good engine rebuild manual as the explaination is rather long but it is not difficult.

Cam must be positioned where lifter is riding on the low side and not on either opening, closing, or top of the lobe. Make sure to keep rocker tip roller down on the top of the valve stem, turn pushrod between thumb and index finger of one hand while tightening nut with other thumb and index finger. when you feel just slight resistance to the turning pushrod, and can feel no up or down free play of the rod (without depressing the lifter plunger), this sets your Zero lash. Then you must turn the rocker nut either 3/4 or one full turn more to position the lifter plunger about midway of the plunger stroke. Then hold the top nut at this point and then tighten the allen screw in the center so the lock nut will not back off.

This is my method, and there are much more scientific methods out there but I have not failed to make most valve trains live a long time and also not be noisey.

Some of this will depend on the type of valvetrain (hydraulic or solid lifters) and what brand and type they are. The procedures are, however, very similar. Turn the engine in the direction of normal rotation (the way it turns when it is running) until the exhaust valve starts to open, this is when you adjust the intake rocker for that cylinder (if it is a hydraulic with a stock lifter you would tighten the rocker nut while rotating the pushrod until you just start to feel some resistance, keep in mind you will still be able to turn the pushrods it is just that there will be some slight resistance fealt... this will be 0 lash, you will then tighten the rocker nut about 1 more turn, this will set your preload. If you have Crane, Comp, or other aftermarket hydraulic lifters they will most likely only want about a 1/2 turn). Then contnue turning the motor over in the direction of rotation until the exhaust valve fully opens and closes and then the intake opens and closes, just as the intake is about to fully close then you will adjust the Exhaust rocker for that cylinder followin the same procedure you used for the intake rocker. Once complete you move on to the next cylinder. There are other ways suggested, and most of those will work with some smaller camshafts with less overlap, but this way is the most exact and will work with any size cam made. Good luck