Quote:
Originally Posted by 1969GiPper
Manifold should not be warped so machining not necessary. I suggest you buy the gasket kit GM sells. It comes with the correct gaskets and all the bolts which already have the correct thread locker applied to their threads. Tighten the bolts to the correct torque. Do not overtighten them. If you don’t want to buy the kit from GM, then you need to throughly clean the threads on your old bolts and apply the correct threadlocker to them.
One more very important thing. When reinstalling the push rods and rockers do NOT use an impact gun or air ratchet to tighten the nuts on the rocker stud. Only use a torque wrench. Over tightening the nut CAN cause the pressed in stud to loosen in the head. You won’t even know it until sometime later when you start hearing a ticking type sound. You’ll trace the sound to a loose rocker. You’ll replace the stud and then later on another stud will come loose. And you’ll keep doing this until all the overtightened (loosened) studs have been replaced. The difference between tightening to the correct torque and overtightening to start loosening the stud isn’t much. Trust me many dealer technicians have found this out the hard way.
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Need to correct myself as I got my engines mixed-up. The rocker stud is NOT pressed in the head, it’s threaded in. When you overtighten the rocker nut with an air tool you start to pull the stud threads out of the aluminum head. The damaged threads in the head can be repaired using a insert. And yes there is a tool that eliminates the need to loosen the rocker arm nuts. Definitely worth having if you work on these engines regularly. The one I have is made by Lisle.