[1turbofocus]

The 2.5 head is to big unless your going to be all out racing , karl knows nothing about the head and what it will or wont do

I have a in house superflow flow bench and a in house dynojet dyno ,

The cosworth ported would be a restriction to the 2.5 heads potential it would need to be a full custom intake manifold then to get its full potential you would need an 2.5 engine with no less then 12-1 and turn it to about 9500 with a dry sump pump

For the street/track use the 2.5 short block and the 2.3 head

Tom