well i picked up a ls4 TB and i started looking at it. there seemed to be alot of flow restriction to it. so i started to fix some of the issues. did some porting all around it and smoothing over some stuff. then polished when all done.

fo those that might not know a stock cobalt TB is 72mm and a 5.3L V8 ls4 TB is 77mm i got mine to 80mm.

im still waiting on the rest of the parts to get this on though. its just another piece to the puzzle.

here is it ported and ready for the sanding process







here it is all sanded and ready for polish sanded up too 2000 grit





and then all finished. the perfect polish brought to you by mothers







thanks for looking

 

All but one of those photos make my brain hurt.......

 

yeah only one is in focus. kind of hard to look at man. but the one that is in focus looks great!! will you have to get a bigger butterfly since you opened it up to 80mm?

 

no it curves from 80 to 77 where the butteryfly is. i didnt want to mess with the butterfly since its electronic. im hopeing it still works lol

my hands were alittle shakyafter porting for awhile

 

oh ok. i was wondering about that. keep us posted on how it works out for you when you put it on man. good luck

 

congrats on your shiny new paper weight

 

 

y do you say that? just wondering

 

Because you will hate it after a few days of using it... thats if you can get it to run right with it!

 

To much air

 

thats halarious....So its 80mm at center and 77mm at the butterfly and your talking about restrictions. Holy hell batman. You can do a lot more damage than good on flow rates if you have no idea what your doing and i think you may have just done that. You created on oval TB. Good luck and god speed.. you'll need it

 

Trifecta Performance has gotten the ls4 TB to work on a 2.2 already. Talk to them about it.

 

im not worried about it not working properly. ill let the tune to the talking