89 Chevy S10 with 2.5L sounds like a diesel?

720ST

New member
The motor was gone through and rebuilt but the top end was not. Why does it sound like a diesel motor? It's a tapping sound and it has good oil pressure. How long do you think it will last like this? And what can be done to fix? Please help, thanks.
About how much will the repairs cost? And how long can it run like that? Thanks again for the help.
 
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