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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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#22871 07/29/2003 2:29 PM | Joined: Mar 2002 Posts: 12 New Guy | | New Guy Joined: Mar 2002 Posts: 12 | I have a 250 in a 55 GMC. Due to previous low oil pressure I replaced rod and main bearings and oil pump. At start up oil press. is 40 psi. After about 20 min. the hot idle press. is near 0 psi. At road rpm the press. is up to 30 psi. All bearing clearances are .0015 min. Any ideas on why this is happening? The engine runs smooth with absolutely no noise. Thanks. :confused: | | |
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