Whats the stock cc on alum lt1 heads? I am trying to figure out what my cc is on my heads because I have had them milled before because the car overheated. So any idea around what cc what mine would be? When you mill heads does the cc number go up or down? Stocks 54 right?

 

C'mon, that's an easy search. But since I just saw it again, here you go:

 

CCs go down when you mill the heads.

 

Follow up: It is pretty easy to measure the chamber size IF they are off the car. You didn't say.

Set the head chamber side up, and not quite level. Put a piece of flat plexi with a small hole in it over the chamber, with your intended spark plug screwed in. The hole goes at the uphill end, so air can get out better. Then fill it with oil or water with a syringe, and measure until it's full. It helps to put a little grease around the perimiter of the chamber to keep the liquid from seeping out. Some guys prefer oil, but I don't like the mess. Just wipe down after and spray with WD.