I agree, going from 10-1 to 12-1 should make a difference by itself. But on a 230, going from the stock chamber head to the 194 head is not that much of a gain compression-wise, and given his limitation on how much he can increase compression because of the turbo, there just isn't much he can gain without being too much. Putting the 194 head on the 230 isn't going to gain as much compression, 1/2 a point at best, as it would a 250 or 292 which is 3/4 of a point(stock chamber for stock chamber). Also, im not saying the 194 head is bad, just the large chamber is better. If you would have had 12-1 compression with the open chamber head and done the Webers, you would have been that much faster....
