Designed for connecting dual fuel hoses to your carburetor, these Y - style fuel blocks are engineered for optimum flow for both street and race applications. These blocks feature 38 NPT inlet and outlet ports. For maximum flow applications, our race blocks utilize large 12 NPT inlets with either 38 NPT or 12 NPT outlet ports. All blocks feature a 18 NPT pressure gauge port and are anodized red for a great appearance.