I was driving my '53 Chev 3600 yesterday...all gauges displaying normal info. Got home, parked and turned off truck. A half hour later started truck to pull into barn. Oil pressure gauge normally reads 15 lbs but now reads about 7 going up slightly when I increase RPMs but not up to 15. Anyone have any ideas. This engine has not been abused; oil changed regularly, only 31,000 miles on the clock (I know this is accurate as truck has been in the family since brand new).
