Thanks for the feedback guys.
I really didn't mean mean for this type of engine to replace a big block FE. It would be more for the guys who love high winding small blocks. Although I think the 393 stroker windsor engine making over 700Hp would get some attention.
Yes, it is the new Arao head. And yes they are costly, $5,000 per
pr. That's why the high price on the engine, plus there is a lot of dyno time, trying several different cams and spring combos. So the cost could be less once eveything was figured out, plus paying full price for parts right now. No deals with parts venders yet. So I think the price for an engine like this could be more like $12,500 once eveything was ironed out. As far as some of the questions on the heads: I would keep the cam on the mild side of lift and duration to keep the spring pressures low, because you are working two smaller valves with one pushrod and lifter, this is how you keep it durable. You don't need a big cam with the 4 valve head anyway. The test that Arao did with a 357 c.i. small block showed 650+HP and 525ft. of torue with a 219 dur. cam @.050 and .479 lift int. and .519 ex. Plus the torque was 500ft. down at 3,000rpm and stayed above 500ft. all the way past 6,000rpm. That's impressive even for a big block. With that kind of torque at 3,000rpm it will be very streetable. For more head info check out araoengineering.com