{"product_id":"pro-163-cnc-head","title":"Pro 163 CNC Head","description":"The 4P Pro 163 CNC Head is a high-performance engine component from 4Piston Racing, engineered for significant airflow improvements and power gains. This V2 model, initiated on 11\/10\/2018, boasts a 400 CFM flow rate with a redesigned intake for superior performance. The head features slow-cut, 5-axis CNC porting for exceptional machining quality, and utilizes a 4 Piston 50-degree, 37mm valve that offers better flow and reduced weight compared to other 37mm valves.\n\nConstruction highlights include a precision CNC valve job using the latest NEWEN Fixed Turning technology and full-length bronze manganese guides for enhanced valve stability. This head is recommended for All Motor Street, USAC Midget, and High HP open class Road Race applications, particularly for 2.4L+ displacement naturally aspirated engines running E85, Methanol, or Gasoline. While not primarily intended for high boost, some turbo applications have seen success.\n\nThis head fits PRB Type S K20A2, RBC Civic Si, RSP, and PPA\/PPL K24A1 CRV heads. Importantly, it does not fit in RBB TSX castings. All heads require a core, which can either be sent in by the customer or purchased from 4Piston Racing.","brand":"4Piston","offers":[{"title":"Default Title","offer_id":52686706573624,"sku":"PRO-163","price":1850.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/660178010.webp?v=1784876064","url":"https:\/\/store.motormia.co\/products\/pro-163-cnc-head","provider":"MOTORMIA","version":"1.0","type":"link"}