[Jim Hand]

John,
Are you asking that if I had changed the engine and car to run higher RPM, would the heads have worked better! Just as explained above, an engine needs a certain amount of airflow to run to a certain RPM optimally.. And airflow over and above that will make no difference in power. However, in order to get that excess airflow, the ports will have to be enlarged, and that most certainly will affect engine power.

And I did not get "poor" performance from the KRE heads - to the contrary, they performed very well indeed. - best of 11.69/115.5. But just not as good as the small port iron heads did!

I didn't install the heads with the idea of retooling the car to optimize the performance of the heads. I installed them in order to have new modern trouble free parts that would also remove a bit of weight.

If I had wanted to change the RPM range of my engine and car, I didn't need to buy new heads - I could have simply ported my iron heads for more flow and bigger ports!

Incidentally, I was running the RPM intake at all times with the KRE heads. And the cam I was running was my regular cam of 234/244/112, and not the 041. the new custom cam was specifically designed to add the low RPM power lost by the bigger port s on the KRE heads. And it did that, but unfortunately a 108 LS cam of only 233 degrees also quits making good power much earlier in RPM then a 112. Accordingly, what it picked up in the lower RPM, it lost in the upper RPM, besides idling much worse!

Jim Hand