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360 engine valve train noise |
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Joseph Lamb 
AMC Apprentice 
Joined: Nov/15/2018 Location: tampa florida Status: Offline Points: 112 |
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 Topic: 360 engine valve train noisePosted: Jun/23/2021 at 2:04pm |
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Good day all.
We have a 1971 SST Javelin 360 4bbl automatic . This 360 has at idle has a light light tapping noise that sounds like valve lash noise . I did not build this 360 and no only that it has good oil pressure hot or cold , it runs really well under all circumstances , barks the tires on first gear upshift , and is fun to drive . No exhaust leaks on this engine , so I have always heard this light light tapping noise . Compression in all 8 is about 175 pounds , Two years ago I did replace all of the rocker arms with new steel rockers , I inspected and found that some were worn at the valve end . New rockers did make an improvement . I am changing the intake manifold next month and was thinking about installing 16 new lifters to see if I can reduce this noise . Am I just looking to create a problem here ??? Any thoughts out there in AMC land ??????? Appreciate the input .
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1971 Javelin 360 SST
1973 RS Z28 350 L82 4SPD 38 YEARS 1958 Chevy Biscayne 235 powerglide 1997 Jeep TJ 151 5 speed 1960 Lark Convertible |
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Trader
AMC Addicted 
Joined: May/15/2018 Location: Ontario Status: Offline Points: 6881 |
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Posted: Jun/23/2021 at 3:32pm |
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Lifters wear with the camshaft. Unless this is very low mileage, new lifters will likely cause more problems later with the worn camshaft. It can be done, but expect to rebuild the engine sooner then later when all the lifters start making noise.
An exhaust leak can sound like a bad lifter. I'd look for an exhaust leak first. If you have one bad lifter and know the ones installed, you can buy a new one and install the internals in the old one. Basically rebuilding an old lifter. This may or may not work depending on what you find wrong with the lifter. When you pull the intake, inspect the camshaft.
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Grey Ghost
AMC Apprentice
Joined: Oct/11/2009 Location: Route 66 Il. Status: Offline Points: 158 |
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Posted: Jun/23/2021 at 7:49pm |
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Just a thought, if the motor has the original intake check to see if the choke stoves gasket is in place. I had a local guy from my town contact me about helping him get his newly rebuilt 390 running, after getting it running it sounded like it had a lifter tick, turned out the choke stove gasket was missing.
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Lets go racing!
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73Gremlin401
Supporter of TheAMCForum 
Joined: Mar/02/2013 Location: Stmbt Sprgs CO Status: Offline Points: 946 |
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Posted: Jun/23/2021 at 9:15pm |
THIS! Especially if that '1 lifter tick' is coming from the rear of the motor on the passenger side....
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73 Gremlin 401/5-spd.
77 Matador Wagon 360/727. 81 Jeep J10 LWB 360/4-spd 83 Concord DL 4-dr 258/auto  |
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troutwilly
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Joined: Sep/14/2007 Location: Carriere, MS Status: Offline Points: 992 |
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Posted: Jun/23/2021 at 10:32pm |
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Agree with the exhaust leak idea. You didn't say which side the noise seems to be on. I would first try tightening the header and choke stove bolts. If you get a turn out of any of them it'll be the problem. Don't crank down on them too hard. Exhaust bolts can be difficult and you don't want to break them. After that you could try adjusting the rockers again.
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Bill O.
70 AMX |
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FSJunkie
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Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4742 |
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Posted: Jun/26/2021 at 1:11am |
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The new production Melling stock replacement lifters are junk. They often make more noise than the original lifters. But, they are reliable and won't cause any problems. I have many miles on them.
The exhaust heat damper on the passenger's side exhaust manifold outlet often rattles in a way that sounds like valve noise if it's missing one or both of the anti-rattle springs that normally are attached to the shaft.
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1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
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Joseph Lamb
AMC Apprentice
Joined: Nov/15/2018 Location: tampa florida Status: Offline Points: 112 |
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Posted: Jun/27/2021 at 7:02pm |
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Yes the noise seems to be on the passenger side , so I will check all that you say . Remflex gaskets in place and I think Remflex are good gaskets , bolts tight , etc
put it on the lift tomorrow thanks to all
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1971 Javelin 360 SST
1973 RS Z28 350 L82 4SPD 38 YEARS 1958 Chevy Biscayne 235 powerglide 1997 Jeep TJ 151 5 speed 1960 Lark Convertible |
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Grey Ghost wrote: