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There are two types of oil filter adapters used on small-block Mopars: the common plate-type (shown here) and the cast 90-degree style. Some headers require the 90-degree type, but the tti pipes we planned to use will clear either setup. typically, the adapter plates have four 91/432-inch holes through which all oil must flow to reach the engine. It's a good idea to drill four additional holes (as shown on this plate) to help reduce the flow restriction.