Largest turbo

[BLKCreeper]

What is the Largest turbo I can go with on a stock engine. Got the normal bolt ons. But at what size am I really not going to get anything extra from with not porting heads intake etc?

 

[turbo2nr]

I'm trying a Turbonetics T-70 Ball-bearing on a stock motor. I just took off a TE-61, and also tried a TE-67 (GT-67 from Limit). I went to a track day and saw a friend running a T-72 on a stock block, and ran almost 9s. Full weight, normal street car. The TE-67 spooled very fast. I think the 70 I have in my garage will be great on the street also. So....I don't know what is too big....yet.