Re: {Chrysler 300} Rocker slop

It is normal for hydraulic lifters to “bleed down” show a gap sitting . Whole idea is not to have to set any precise clearances , — does not matter

when oil pressure comes (assume valve is closed) lifter expands up , giving zero clearance .

When valve starts to open , a check valve in lifter prevents that oil from squeezing back out ,as pressure inside is far higher than engine oil , as it lifts valve .

It loses a tiny bit by design so it can track changes , over and over in gap as engine warms .

In chev , where they inherently have adjustable lifters with hydraulic ( screw mounted ball rockers ) they adjust to zero then “ one turn more “ so lifter is like .030-050 down ( can be more) to allow the above action .

Chrysler on B block controlled stuff ( tolerances) so just “throwing together” on assembly line the lifter should be somewhere in the middle of travel no checking or adjusting needed .

Unless someone messes with it / non stock parts . Note base circle of cam is important to this , so reground cams may need longer pushrods etc

All is good if no loud clicks ,or ticking , (indicates one is stuck )

I have found mobil one frees up stuck ones . Sometimes takes 3000 miles. Good stuff

ymmv !

On Aug 17, 2025, at 12:18 PM, Kevin deGraauw <kdegraauw@xxxxxxxxxxx> wrote:

I've seen exactly that with stock hydraulic non adjustable rocker arms on big block mopars. Seems the pushrod and the rocker " center" themselves when running so unless you have a wild cam in there with huge lift, its probably just fine. If you are still worried, you can pull the shaft off really easily and clean and check the sides of each rocker for excessive wear- the stamping ( when made) of the rocker itself sets the spacing on these.

Kevin

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From: 'Jay Williamson' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Sent: Sunday, August 17, 2025 8:59:07 AM
To: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: {Chrysler 300} Rocker slop

Decided to do a checkup on the valve train while I was this deep into the valve cover gaskets replacement. Wondering if this much slop is normal between rockers or should I look into adding shims? Thanks in advance for your input
Jay Williamson
317-223-1379

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