Another problem with the stock timing chain cover is the oil pressure relief valve assembly that was originally designed to bypass oil inside the pump to regulate pressure. These parts wear out, eventually causing pressure instability. The filter bypass would work when the pressure bypass was at capacity, and that was all the time, since both bypasses were barely adequate for the stock high-volume oil pump. The Bulltear oil pump cover eliminates the stock oil filter adapter and the filter bypass completely. The pressure bypass is on the plate and recirculates the oil in the pump using OEM replacement parts. The spring and the plunger are set for 70 psi, protecting the filter and the engine from contaminated oil.