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This pump is the factory GM high volume oil pump that is a direct replacement for the stock oil pump and is recommended in many applications. This pump works with stock timing set and oil pan.  Lingenfelter suggests this pump for stock crankshafts and aftermarket crankshafts.  

The pump includes a high pressure and standard pressure spring for the relief valve. The high pressure spring is installed when you receive the pump to make the pump high volume & standard pressure you can switch to the standard pressure spring.  

 

Includes: Oil pump pick up tube o-rings M-29509-BP & M-29511-BP, red high pressure spring, white standard pressure spring.