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If it's actually the rockers arms that are "chattering" while the engine runs, you may need to adjust the lash.
If there are Solid lifters in the engine, you may want to switch to hydraulic lifters and adjust the rockers to the moment of "zero lash". Adjust them in pairs per cylinder while the lifters are in the down position (both valves closed).
When you reach zero lash on the rocker arm (the pushrod will suddenly stop spinning freely in your fingers) add an additional quarter turn to the rocker arm nut to set the "pre-load" of the lifter. This just means that the pushrod will be pushed down slightly in the spring loaded hydraulic lifter and when the engine runs, the oil pressure will keep pressure on the lifter and thus the rocker arms will run silently.
More detailed info at BoxWrench.net if you need it...
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∙ 15y ago
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How do you replace lifters on a 5.3 vortec?
You have to remove the engine cylinder heads to get to the lifters on the 5.3.
Will vortec heads work with out roller lifters?
YES, they sure will.
Can you use a vortec intake on a lt1 block?
Regardless of the block, you have to use Vortec heads to use a Vortec intake.
Where are vortec heads?
Mounted on top of the block.
Will regular old style 305 heads work on a newer vortec 305 block?
The heads will fit the block, but the vortec intake manifold will not bolt to the old style heads.
When did vortec heads first appear?
the vortec block and heads were introduced in late 1995 but actual vortec motor started coming in vehicles in 1996
Do the intake bolts bolt in the top of the block or into the heads on a 305 vortec?
Into the heads only.
How do you replace the lifters and pushrods on a Chevy vortec 350?
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.
Will pre-1990 heads fit on a vortec block?
Yes the heads will, But the problem is that the vortec intake won't bolt up to the pre- 90 heads. DIFFERENT BOLT PATTERN.
Will vortec heads of a 350 fit onto a pre-1994 block?
== ==
Will the Chevy 350 vortec heads fit on an amc 360 block?
no they will not
350 vortec heads on a 400 small block?
You must drill the steam holes in the heads to coincide with the ones in the block or it will overheat QUICK!!!
