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I recently purchased a Blazer with a 396 that was bored 60 over. Haven’t driven it longer than 30 minutes at a pop. Recently changed oil and after a few days the oil pressure went from around 50-55psi while driving to 60 at idle and about 70-75 while driving. Ran some seafoam through did another oil change and it’s at the same psi. What are my next steps. Any help would be appreciated