3/8 Inch Street Performance Pushrods XDPThe XDP 3 8 inch Street Performance Pushrods XD387 will strengthen the weak link in the valvetrain of your 2017 2020 GM 6. 6L Duramax L5P. The stock pushrods in your Duramax engine can barely handle stock power levels. With greater cylinder pressure and valve spring pressures from elevated engine RPM, the additional stress can rapidly push the limits of your factory pushrods. Even in lightly modified builds, the OE pushrods can rob you of power from