This is a head I developed when I was at Straub and something I was wanting to develop for a long time. These two customers (with the 427's) provided the opportunity. This is what I called my "little big port" or "game changer" which is a small 290cc rectangle port in the conventional location with a small chamber made to work on 427's and 454's. I started the idea with a 2.19 valve which really would be better for these combinations but for "marketing" I was talked into a 2.25 valve. They flow >370 with the 2.25 valve with really good low and mid lift numbers. They are done on an AFR porter casting.What size intake valves and which heads were on those?!!!! Nice numbers.
I did a post on it a while back:
A little over a year ago I got a chance to design a head that I had been wanting to do for some time, seeing a need in the BB Chevy market for a "small" rectangle port head rather than the oval port offerings that are available. Oval port heads, even large oval port heads are OK, but they're...