I have talked now to several different people about this topic, and Have not really gotten any answers. Aside from the 302s reputation for cracking how are they compared to the 67 273 heads.

I believe the 67 273 heads are 920s. At anyrate, they are also a closed chambered head and have roughly the same Chamber size and the same valve size.

Does anyone have any flow charts or information about each of these heads to make actual comparisons.

I am not sure whether to have my current heads worked a little, or just to start with a set of 302s and shelf the current ones.