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

[PTAddict]

Port size can't really be directly compared between 1st gen and LSx motors - port length, port height, valve size, and valve angle differences make the comparison not really useful.

235 CC would generally be considered quite large for a 434 street motor, unless you're going for higher RPM power peak (6500 - 7000). Even then, many engine builders will take the philosophy of using smaller ports. John Lingenfelter used to build 420 CID small blocks with heads in the 190 cc range, shooting for brutal torque and 550 HP or so.

If it was my motor, I'd think about the newest version of AFR 210s or 220s as a starting point. Call Tony Mamo over at AFR and tell him in detail what your goals are - he'll be able to make a recommendation on both heads and cam. I've used 3 sets of AFRs on different builds now, always with excellent results, and AFR's customer service has always been great for me.