Yes cam bearings can spin and block the oil gallery holes, therefore stoping oil from getting to the top of the engine.
Yes it does. Chevy did not use solid lifters in that engine.
Yes it does.
Specs for main bearings on a 2003 Chevy trailblazer with 4.2 engine .
Hydraulic lifters would be STOCK from the factory. On the 84 engine.
No it does not, Unless someone has MODIFYED it.
yes like 350 engine
yes
There is no adjustment- the engine has hydraulic valve lifters.
It's not recommended to change just the lifters. The cam and lifters should be replaced together. To get at the lifters, you can remove the rocker covers and intake manifold, loosen the rockers enough to get the pushrods out, then pull out the lifters.
Cam bearings, Rod and Main bearings. That will be all of the bearings required to replace when rebuilding a 350 engine.
hydralic lifters
remove intake manifold and rocker covers. loosen nuts on rockers and remove pushrods. lifters should lift right out of their bores.