quote:
Originally posted by 4V & Proud:
I'm worried for you that the 185 ports will not support your modest goal...
also not sure a traditional Cleveland cam would be optimal, George ?
The 185 ports are an extreme take on the CHI philosophy, they boost velocity by shrinking the ports, and restore some of the airflow and top-end performance that was lost by raising the ports. The roofs of the 185 intake ports are at least 1/8" higher than the roofs the 4V intake ports. I believe the heads were originally designed at the request of Dave Storlein. I would imagine the small cross-section intake ports are tuned to make peak horsepower at about 5000 rpm out of the box, and to raise the rpm at which peak horsepower occurs requires stretching the camshaft's intake duration, this of course is not necessary with the 4V Cleveland heads (which are tuned for peak horsepower at about 6000 rpm), but it is quite normal for other heads like a 2V Cleveland head or a SBF head.
The cam spec I mentioned will "work" but the engine will tend to make peak horsepower a bit lower than it would with 4V heads, about 5500 rpm. If Greg would prefer to have horsepower peak at a higher rpm, there are a couple of other specs I would choose to use. Greg just let me know.