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Both Doug Thorley's and Gale Bank's headers are tri-y designs.
As to the long tubes not adding power, I'm not saying they did nothing, but we couldn't tell a difference in the "seat of the pants" dyno. But also to SFaulken's point, the heads are lack luster, and the intake system is not overly great either. The bottle neck on these motors isn't the exhaust manifolds, like it is on the small block trucks.
These seem promising https://www.ford460headers.com/detai...=0&ItemID=1174 I just got off the phone with one of the guys there and out of all the tech people I've spoken with he has hands down been the best to talk to.
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