Well, I guess I was wrong about the duration @ .050. I was looking on the Red's Headers website ( okay so I'm also a flathead Ford junkie ) where they sell several old grinds and the 248 deg Schneider has 220 deg @ .050. I guess the duration @ .050 can be a little wilder on a flathead, due to the poor breathing characteristics. That much would definitely start to affect the idle quality in a small ohv V-8.
