I'm putting an LS2 intake on a LS4. I'm guessing these match. I'm overseas and purchase the parts and have them sent to the shop doing my project. The LS4 is supposed to have LS6 heads.
Anyhow...for the Holley Dominator DBW, there are two GM TB's that are calibrated for this ECU.
GM - 12570790 http://www.ebay.com/itm/05-08-Corvet...sories&vxp=mtr
GM - 12580760 http://www.ebay.com/itm/2006-2010-Ch...sories&vxp=mtr
To start, are the bolt patterns the same?
Also, is either TB better than the other?
The second one is considerably cheaper-even to justify an adapter if necessary. But hows the reliability/quality?