The 1990 will take flat hydraulic.
YES it does and it is a roller cam and hydraulic lifters.
No it does not. Chevy did not start using a roller cam until late 1995.
yes like 350 engine
They all had hydraulic lifters. To determine if it has roller lifters, you'd probably need to take off the intake manifold and have a look.
No, first generation 3.1 does not, second generation does.
If you have a 2001 or newer engine, it comes with roller lifters and roller rockers from the factory.
Doesn't matter on a roller lifter. Flat tappets must remain with the cam lobe they were broken in on.
low oil pressure or the seal on the roller tappet is old and it takes the roller tappet a minute to pressurize again.
hydralic lifters
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