Universal T4 Riser Block With Waste Gate Port (116006059)Description T4 Riser Block GM 6. 6L Duramax With wastegate port 2 3 8 inch Height (116006058). An additional turbocharger riser block is required for larger bodied turbos (GT42R or larger). Applications: Features T4 Riser Block (With Wastegate Port) 2. 375 Inches tall 1. 875 Inch side port Wastegate port sized for 1. 75 inch or 2 inch tubes Billet Steel Installation parts include (4 studs and 4 nuts) Sold As A Kit