Is a 235 cc head too big for a street 434 ??

[DRJDVM's '69]

I'm building a new small block 434 for the camaro and am still working on the heads.

We originally went with the Dart Platinum Pro 1's which is a 227 head. Well after waiting 6 months for the back order, they arrived... the first issue was there was a casting hole in one of the runners near the pushrod " galley". Darts response was "well you know you can just weld that up". That pissed me off to buy a brand new set of heads and have to fix them.

Then the second issue was the flow. They advertise 309 cfm.... the best we could flow them was 240 !!! Darts response was that they flowed them with their valves... fine.... we get one set of their valves and flow them again.... no change. I know the big thing is "wet flow" now, but come on..... 60 cfm difference ??

So the Darts are going back.... so now I need a new set of heads.

The car will be 99% street driven, manual 5 speed, 434 small block, Victor Jr intake, Dart block etc etc. We havent selected a cam yet because we wanted to get the heads nailed down first.

My engine builder is looking at the Brodix heads. I just saw some stuff about World putting out a Motown 235 cc head with a 72 cc chamber.

So is a 235 head too big for a street driven 434 small block ?? I dont want to get lured in by "bigger is better"