OK...so here I go reading the threads on rec. port heads, and I get guys flaming oval port heads as if there's only one type of oval port head and that they all suck.
First off, for those of us who are new to BBC's, there are TWO types of oval port heads: small oval port (aka "peanut" port) and large oval port.
Small oval port heads are very common on heavy cars and trucks. These heads feature high port velocity at lower RPMs for making some good bottom end torque. Up around 4500RPMs, they start to choke the motor and are not suited for building horsepower much above that.
Large oval port heads offer the best of both worlds, building low end torque while allowing the motor to breathe up to a much higher RPM. It is my understanding that large oval port heads are good up to about 6500RPM if you fit them with larger than stock valves.
Now I remember speaking to Chris awhile back in a PM about the large oval port heads, more specifically the casting '353049' heads which I find on a lot of jet boats. Chris had flat out told me that the '049' heads are capable of making some serious power. Was hoping Chris could come onto this thread and save the fate of large oval port heads and give us some facts about them as well as disspell the myth that large oval port heads will choke the motor around the RPMs we spin them in a jet.