Factory LS cylinder heads are machined with metric M12-1.5 coolant sensor ports, so your factory Small Block Chevy sensor won't thread in to them. This adapter allows you to keep your original sensors and integrate them into your swapped LS engine. Adapter has a female 3/8 NPT port, .85 deep. Refer to thread chart to check your correct fitting size. Made in Wichita, KS from aerospace grade, USA billet aluminum This adapter will fit all LS series engines. Adapters are sold individually, and include 1 sealing washer UPC 656729846810 ASIN B015NG418C Model 551179 Brand Name ICT Billet Style Name Modern Unit Count 1.0 Count Output Type Analog Part Number 551179 Manufacturer ICT Billet Material Type Aluminum Mounting Type Flange Mount Item Dimensions 2.6 x 3.1 x 1 inches Measuring Range Up to 1.7' or 1.0' Sensing Distance 0.85 Inches Smart Home Compatibility Not Smart Home Compatible Upper Temperature Rating 125 Degrees Celsius Specific Uses For Product LS engine swaps with SBC/BBC sensors Global Trade Identification Number 00656729846810