Oil Filter Block Adapters BLOX Racing oil filter block adapters are CNC-machined from high grade, billet aluminum. These high quality adapters make installing an oil pressure or oil temperature gauge a breeze! Clean and simple. Â Additionally, oil filter block adapters can provide an extra source for oil where needed in certain types of engine builds. Â The filter block adapter mounts between the engine block and oil filter. Two universal filter adapters are provided. Â Specifications M20x1.5; 3/4" x 16UNF filter adapters 1/8 NPT ports 1 1/8" thickness
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