I have the stock TB on my lt1 with a p600b and it dynoed 400rwhp and I was wondering if I should go with a 52mm or 58mm TB. I was wondering the gains I would see and if I needed to go with 58mm. I doubt I will be upgrading my blower at least for the time. I just wondered if the 58mm would be worth getting or just go with the 52mm.

 

My guess would be go with the 58 mms...I've got it on my n/a 383 and its great...I would think this would only magnify much better with forced induction...any blower guys out there?
--Alan

 

I'd definitely step up to a 52mm TB...unless you change pulleys and run more boost you still won't need a 58mm TB...