What oil pump to use.

mopowers said

My understanding is a high pressure pump is nothing more than a regular pump with a high pressure bypass spring installed. That spring come standard in high volume pumps I believe.

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I thought so, but no it does not. Mopar Performance used to sell a HP version of both big and small block oil pumps. They were HV pumps modified with the HP spring. High volume and high pressure. You can do the same since the high pressure springs are still available.....for now. The big block spring fits the slant 6.