Late-Model Engine Prelubing - Build A Budget Pressure Luber
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We drilled a common 12mm coarse thread bolt with a 5/16-inch drill bit and tapped the hole with 1/8-inch pipe threads to use an Earl's 188 pipe to -6 male AN fitting to return oil to the reservoir. We also could have used a rubber hose and some brass fittings that would have been less expensive, but it wouldn't have looked as cool. View Related Article
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