I have a STR 68mm throttle body and it is sticking really bad, from what i have heard this is common with cast throttle bodies. I picked up a stock LS throttle body and was wondering how much i can bore it out. would i be able to get all the way to 68 mm to match what i currently have?

 

i cam pretty sure max bore on a stock ls throttle body is like between 62-64.