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On most vehicles rocker covers are not normally bolted down that hard. Install the bolts by hand until finger tight then tighten in sequence a Quarter turn at a time until you get to 20 Ft/lbs and NOT tighter. Rocker covers are not normally exposed to full oil pressure so don't need to be a high torque setting. I often go to 15 Ft/lbs first and run the vehicle for one or two miles to check for leaks. That gives me that extra 5 Ft/lbs to avoid over tightening bolts.
Simple fix. Take the fuel tank off and remove the four bolts that hold the rocker box covers on. If the rocker box is leaking there, simply put a new gasket in place, carefully align the top plate and put the bolts back in. Torque them to 100 inch pounds.
If the lower rocker is leaking remove the smaller 1/4" bolts and then remove the larger 5/16 inch bolts. Remove the larger bolts a turn at a time until they are completely loose. Lift the lower rocker plate and replace the gaskets. Reposition the lower plate and align the pushrods in the rocker arms. Do not mix up the push rods, mark them if necessary. Tighten the 5/16" bolts down evenly until just seated. Then put the 1/4" bolts in. Torque the 5/16" bolts to 15-18 ft. lbs and 1/4" 10-13 ft. pounds. Reinstall the middle and upper rocker boxes and torque those bolts.
I'd be interested in knowing how the cam chest cover cam off changing a gear box gasket but.
In order to get the cams back in and to insure their proper timing, I'd put the rocker arms out. I'd pull them all out but you're free to do whatever you wish. Remove the top and middle rocker cover on the front clinder. Remove the large bolt that hold the lower plate and the rocker arm for the front cylinder in. Tap the rocker arm shaft out of the rocker arm and remove the rocker arm. You can then get your cam into position. Now, to get rocker shaft back in, rotate the engine until the front exhaust cam has the valve in it's closed position. Reinstall the rocker arm and shaft and torque the bolt to 25 foot pounds. Reassemble the upper and middle rocker box covers.
unless you have the motor out its near if not impossible to get a torque wrench on the bolts so what most do use blue loctite on your bolts and draw all bolts down evenly till you make metal to metal [cover to rocker] then maybe 1/8 turn more the key is even torque
Get you a new gasket for the rocker cover, make sure you clean the mating surface good,and all traces of old gasket, and silicon etc. make sure you dont overtighten the bolts to the rocker cover. the torque for the rocker cover is 35 in lbs (4nm). as far as vavle clearance it is none adjustable. A clicking valve can indicate worn lifters, sometimes an oil change will quiet down noisy lifters. If noisy lifters persist you would have to service the heads. If you decide to do that yourself you can ask for a procedure on that too later on. Removal of the head is very difficult, because you need to remove a lot of things, and require you to do a timing on the engine.
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