Can you tell me what numbers are written on the TB? I bought a used one from a gent and he told me it was a 58mm. But the box it came in said it was a 52mm. I have a few letters/numbers on the top, TPS side: E.O. D-245-9
On the very bottom, under the coolant passage there is : CST-14

Any help would be appreciated.

 

Just measure it man... the BEST way to figure it out..

 

Ha, I would, but the wifey decided to use the tape measure and of course it grew legs and walked off and wont come back.

 

I have a 58 tbody laying around, it has the numbers you say. You will be able to tell the difference between a 52 or a 58. The 58 tbody's blades are big. 52 looks small.

 

With a stock LT1 is there a seat of the pants feel from changing to a 52mm or a 58mm??

 

not at all

 

What about a heads/cam lt1 pushing like 450 at the flywheel? I have stock 48mm right now and wanna know if I'll see any gain going to 52mm...

 

Not very scientific, but I have a 52mm on my 383. According to my engine builder that is all I need.

 

Maybe a 52mm tb will be on my xmas list...prolly not though cuz I kinda want a set of skinnies . Which would you choose tnthub, skinnies or 52mm tb?

 

I'd vote for the skinnies.

 

My dad just bought a car and it comes w/ a set of skinnies so I'm set there. Maybe it's a sign that I should get the tb. Ahh, prolly not.

 

Unless your going forced induction Thers no reason to go to a 58mm