#4448308 heads have any potential?

Yes, absoulety. However, there max potentail from what I have been told is not as good as a older head. This may be the head or the porter. Excellent results are still obtainable even with the 1.88 valves.

MP used to sell these as performance heads and used to have templates to port them. There porting templates may still be available and there designed for the 1.88 valve only. MP has said there template ported small valve head has the abilty to make up to 100 HP over unported heads. Of course, at this level, there pushing the head/engine combo hard.