quick view Add to Cart PLM PLM Precision Works K Series Upper Coolant Housing & Filler Neck K20 K24A1 MSRP: $159.99 Precision Works K Series Upper Coolant Housing with Built In Filler Neck Applications: K20A, K20A2, K20A3, K20Z1, K24A1 cylinder heads. Features: Precision CNC machined from billet 6061 aluminum Integrated filler neck with more... Add to Cart Add to Wish List Add to My Wish List Create New Wish List Compare