The two are not causally related, however... sitting for a long time could result in both a dead battery and oil draining from the lifters.
You have to remove the engine cylinder heads to get to the lifters on the 5.3.
Yes they are.
YES, they sure will.
NO. The 86 is not a roller block.
Please restate the question by describing the problem you're having. Vortec engines weren't invented yet in 77, and "dress up" has no meaning in this context.
It takes about 6 hours and be sure to soak the new lifters in oil over night.
Take off valve covers, heads an intake manifold with throttle body, pull out lifters and pushrods and simply replace It's not necessary to remove the heads for this procedure.
If you attempt to put a vortec engine into a vehicle with a NON-vortec computer, you'll have more problems than you care to deal with.
Every vehicle has a different type of horsepower depending on the specifications of the vehicle. The 1999 Tahoe Z71 350 Vortec Engine has a horsepower of 255 at 4600 RPMs.
There are no provisions for valve adjustments on this engine. Tighten rocker arm nuts to 20 ft lbs torque and you're done.
The Vortec is the GM 4.3L VIN Code "W" engine, the X is the non-Vortec
it dies because you need alot of battery for that