The key to an effective Buick oil system is a properly set up oil pump, which begins with a replacement gear set. Oil pump kits for 198-215-225-231-252-300-340-350-400-430 and 455 include new gear set, relief springs, gaskets and relief valve.
TA’s Oil Pump Recipe. The best oil pump combination for stock, restoration and street/strip set ups is the use of a stock oil pump gear set such as TA 1507 or TA 1508 complimented by a TA 1510 Booster Plate and a TA 1502 Adjustable Regulator. These three pieces in conjunction with a good original timing cover or a TA timing cover and oil pump end clearance of .002” to .003” will provide proper oil pressure and volume throughout the entire power range for most applications. TA 1704 Shim kit is highly recommended for setting up proper end clearance.