Dart Insert Washer, 5/16

Keeps clamping load honest and inserts where they belong under torque.

• ▸Spreads fastener load across the casting surface evenly
• ▸Stops inserts shifting or distorting under repeated torque cycles
• ▸Sized for 5/16-inch hardware on Dart heads and manifolds
• ▸Easy to overlook, harder to ignore when something moves

Running a generic washer or nothing at all concentrates clamping force on a small contact patch — enough to distort an insert bore or encourage movement over time. The Dart washer is dimensioned for the casting geometry it sits against. At $14.35, it costs less than the labour to pull the head back off.