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Discussion Starter #1
after my truck sits for over 10 hrs it makes a weird hollow metallic sound for 40 seconds than goes away. the motor is a 88 4.3 and has about 3500 miles on it. i know its not a rod knock. was thinking maybe a weak lifter. any suggestions

thanx
 

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My new Blazer is doing this too. Going to try a different brand and weight of oil, think the 5w30 dealer oil is not doing the job. Maybe with your fresh rebuild you need to readjust the valves.
 

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Maybe it's piston slap. It can sound like a lifter or a valve tap and often goes away once the pistons warm up a little.
 

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Clean N' Dark
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Try a better oil filter like the AC Delco.

It has a a better antidrain back valve to keep the oil up in the top end of your engine.

This has been know to be one of the causes of the tapping.
 
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