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Old 14-11-2014, 02:09 PM
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Question Noisy lifters on SBC after rebuild.

The 327 in my Impala was rebuilt in the past 12 months. Everything seems fine, but I've noticed that the lifters are very noisy. So much so that doing 80km/h, I can hear them clearly over the exhaust. Really f*cking annoying. It sounds like all of them as well. Not just one or two.

It's not that noticeable whilst idling during initial warm-up, but once I start driving, the noise begins.

Any thoughts?
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Old 14-11-2014, 02:23 PM
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Can be a few things. Solids or hydraulics? If it's hydraics check to make sure the rockers are all seated properly. Hydraulics shouldn't be making any noise at all. It could be you have wiped lobes off your cam or not enough oil pressure up top for some reason. If you have solids your rockers just need to be set again.... I'm hoping you have solids .
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Old 14-11-2014, 02:47 PM
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Thanks for the reply.

Will call the rebuilder on Monday to check what he used (just tried, he's already closed for the day).

Going through my pics of the rebuild now to see if I snapped any shots of them.

By "set again" do you mean re-torqued?
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Old 14-11-2014, 02:54 PM
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I have had problems in the past when the nuts on the rocker shaft have been on and off to many times and they work loose and cause rockers to have too much clearance then the noise starts. This was on hydraulic cam.
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Old 14-11-2014, 03:43 PM
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Yeah sorry mate, should have been clearer, hydraulics have a preset load on the rockers which can mean just making sure the nuts/adjusters are wound down. On solids the adjustable rockers are set with gaps as specified by the cam requirements.
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Old 14-11-2014, 06:19 PM
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They're hitting the rocker cover
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Old 17-11-2014, 08:35 AM
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Didn't get any pics of the lifters during the rebuild. Will have to speak to the engine builder.


Quote:
Originally Posted by rodent View Post
They're hitting the rocker cover
I don't think so. It wasn't apparent when it was initially built. Only started happening after I had put a few hundred K's the through it.
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Old 17-11-2014, 08:51 AM
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Might be time for some new adjuster nuts as they may be coming loose, try readjusting the old ones to see if that makes a difference and if the noise comes back after a while invest in new adjuster nuts, also make sure the rocker posts are not pulling out of the head rare but does happen.
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Old 17-11-2014, 01:24 PM
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Quote:
Originally Posted by Intruder View Post
Might be time for some new adjuster nuts as they may be coming loose, try readjusting the old ones to see if that makes a difference and if the noise comes back after a while invest in new adjuster nuts, also make sure the rocker posts are not pulling out of the head rare but does happen.
I'm reading up on this. It seems it's not uncommon for original nuts to loosen, and quite a few people recommend poly-locks. Anybody had experience with these?
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Old 17-11-2014, 02:55 PM
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The OE crimp-nuts/lock-nuts do come lose. It's common.

Many years ago, I had one start backing off and thought I'd limp the two streets home to tighten it, but it still beat me. Bent the pushrod and smashed the internals of the lifter.
Use Poly locks.

Before you disassemble, make note of which rockers have clearance. So, if it continues to get noisy again after readjusting with poly locks and it's the same rockers, assume those relative lobes are wearing.
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Old 17-11-2014, 03:21 PM
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Do poly locks fit under stock low valve covers?
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Old 17-11-2014, 03:30 PM
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You can get low profile locks that might..
Generally the lowest profile but you may need to take some measurements.
If you have OE stamped rockers, then the lock diameter shouldn't matter.
Assuming 3/8-24..
Summit

Probably these Crowers..
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Old 17-11-2014, 03:32 PM
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Awesome, as always. Appreciate it.
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