No, for sure no!! Plenty of that now !!! I will say from experience, that small chamber 340 heads on a 318 with just a 4bbl on top is a huge change in the performance of the car. I can also say, I've just cam swapped a 318 4bbl, all else stock, and found some pull on the upper end of the RPM's, but I believe from my experience the heads have made "more" of the difference. I was curious of others experience.
