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Old 02-04-2013, 08:45 PM
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disable one spark plug wire at a time while listening. This will ID a rod bearing and which cylinder.
Remove the valve coves and watch the rockers travel ( cam lobe)

Next time don't use a ZDDP additive. {I am not totally convinced that the concentrated bottle of ZDDP mixes well with the oil just by dumping it in} Use a oil that has the Zinc anti wear in it already. (many racing oils)
Sometimes it just plain dumb luck.
Nice that the builder is going to work with you, on it. Yup a good time to upgrade the cam.
A noise that disappears when the motor is warmed up is piston to wall clearance.

A noise that disappears when a cylinder is disabled and comes back when spark is restored is a rod bearing.
Can also be a exhaust system leak. And they can sound like a bearing. Header flange/collector flange gasket
Auto trans flex plate/ring gear crack is common. Exhaust leak is common.
Loose flywheel bolts. Cracked crank pulley. Mechanical fuel pump. Loose cam gear bolts.

Last edited by F-BIRD'88; 02-04-2013 at 08:59 PM.
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