NBS Silverado throttle body porting, half shaft, and coolant bypass 

I ported and polished my throttle body to a funnel shape, and very jumpy. I gotta do this.

The only thing I didn't like was not polishing. I get just making it functional, but those micro pits from cleaving off material definitely can affect the air flow. Basically the same reason you're even porting but on a micro scale. But other than that, sweet job

Get it tuned! It’ll help out a lot

I'd bet there is a slight difference in low-throttle situations (both torque and MPG), and slightly more gains after a couple hundred miles of stock computer tune 'learning' new airflow. Tuning will further help it, but even stock tune will compensate over a couple hundred miles if you don't have too extreme mods. It appears this throttle body is more restrictive than other LS's such as the LS2, so it might have leaned it out more until the computer catches up. Was there slightly more power as the computer relearned? I have a 5.3 in my Envoy XL (and 4.10 gears), so it's relatively peppy.

Why do you need the connector for coolant tube just connect one side to the other and remove one of the tubes? Unless urs is to short? Pause.

I was going to try this porting thing. But what's the point. No power gains. 😊

Thanks for making the video. I will be doing the same mod on one of my extra throttle bodies. I am going to do a comparison of 0-60 on my 78MM turbo 6.0 AWD RCSB sierra. I have a draggy that ill do the test on. I bet a forced induction truck picks up some good power versus your untuned relatively stock truck (from what i can see in the video)