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72SB · 09-07-2022, 04:41 PM

While breaker bar, long screwdriver or piece of fuel line have been used as a stethascope...a $4 Harbor Freight one, for me, gives more precision probing around

With that said you pretty much have a plan of attack to find the noise source. Pulling the valve cvers and then starting the motor would be first thing I would do. I assume you have checked valve lash. One lifter just may be dead. Look for any witness mark inside valve cover, especially if you are running roller rockers for potential contact

If you don't find anything during that...pull intake manifold and then lifters and carefully look through lifter bores to cam lobes as someone slowly rotates motor

If this is a rebuilt flat tappet cam motor....I assume you used high zinc content break in oil or additive

You checked cam end play...have cam button??

09-07-2022, 04:41 PM	#2
72SB Registered User Join Date: Apr 2022 Location: Moorpark, CA Posts: 714	Re: Engine Sounds While breaker bar, long screwdriver or piece of fuel line have been used as a stethascope...a $4 Harbor Freight one, for me, gives more precision probing around With that said you pretty much have a plan of attack to find the noise source. Pulling the valve cvers and then starting the motor would be first thing I would do. I assume you have checked valve lash. One lifter just may be dead. Look for any witness mark inside valve cover, especially if you are running roller rockers for potential contact If you don't find anything during that...pull intake manifold and then lifters and carefully look through lifter bores to cam lobes as someone slowly rotates motor If this is a rebuilt flat tappet cam motor....I assume you used high zinc content break in oil or additive You checked cam end play...have cam button??