the stock lt1 is 48mm right? i was told that the intake was factory ported to 52mm? true or false?

 

True i just mic'ed mine last nite.

 

so my next question is.... i have bolt ons. will upgrading to a 52mm throttlebody do anything? i have a full CAI.

 

Stock throttle body is 48mm and the intake I believe measures out to 54mm.

 

i'll bite

what bolt ons do you have. that would make a difference

putting that info in a sig would help in the future

 

for right now i have a k&n intake, smooth elbow, and airfoil.

i have a magnaflow catback too.

i was just looking on ebay and some nice used bbk 52mm are going for like $100 is it worth picking up?

 

The stock intake manifold has two 52mm holes drilled in it. The chamfer may make it appear larger than 52mm, but the true bore is 52mm.

 

thats an awesome little gadget, where'd you get it and how much

 

Thank you for the clear up Fred. He is using an electronic caliper, they can range anywhere from 30 bucks to a few hundred bucks depending on the brand,quality,features,ect. If you googled it, you would come up with tons of vendors selling that kind of precision measurement tooling, I bought most of my stuff from a company local to me, JL Industrial Supply, but they are a huge outfit that does internet and nationwide sales.

 

cool. I'll have to look into it.

 

so a 52mm one will be beter or just leave the 48???

 

For a bolt-on mod, a bigger throttle body is really not a cost effective way to go. If you had a heads/cam upgrade done, then a bigger throttle body would be of some benefit.