The cnc345 is really better with a 2.25” intake valve.
Were those used in the EZ heads?
The Big EZ comes with a 2.19 intake but Best Machine opened the heads up to 2.250. So we'll be able to swap the 2.250 intakes over to the -1 heads. We kind of have to go this way anyway since the Big EZ castings are not available at the moment. The other choice was to step up to the 572-13 heads but that was going to be a bunch more money and time to replace pistons as well as other parts.
The cost to go with 572-13 is high, since you have to change rocket gear, pushrods, pistons. But power at that level is never cheap. Top it off with a recert on my car, since i am certain it can now run sub 8:50 and exceeds 150 mph, needing a head restraint system this year. In my case, going from a 550 cube 15/1 compression combo with maxed out 440-1 heads sporting 2.30/1.78 valves, dyno numbers were 926 hp. A move to 572-13 cnc385 heads, same size at 549, but an aluminum block, yielded 982 hp at a higher 7600 rpm . Now if i build a bigger shortblock,,,,,,,,,,,,,,,,,
