Platinum Racing Products - NISSAN RB TWIN CAM PRO SERIES CAS BRACKET WITH -20AN HEAD DRAINBLACK, SILVER, GOLD, PURPLE NORMALLY STOCKED OTHER COLORS EXPECT 3 4 WEEKS LEAD TIME PRP Nissan RB Twin Cam Engine Double Pro CAS Bracket With Optional 20AN Head Drain Fitting. Our latest creation and evolution to our billet Cas bracket for the RB now includes a water fitting option to get water supply through the front of the cylinder heads largest welch plug hole. Ideal for dry block wet head setups running up to 20AN fittings, but also a viable