Trick Flow 440 heads, The Real Deal?

I don't have any small bore BBM right now, but I measured the chamber again and got a measurment of 4.340" at the widest point, so unless you have at least that size bore I don't see the point. They claim a bore of at least 4.350" and I tend to agree. You can try to make the big 2.19 intake valve work on a small bore 383 but that's like running a 2.08 on a 318, makes no sense.