Originally Posted By: OVERK1LL
They are a very interesting head.
However, these are a set of ported BOSS 302 heads belonging to Jay Allen of Camshaft Innovations:
These flow OVER 400CFM.
TEA has a number of SBF heads that flow at or over 400CFM.
1. Brodix Neal: 435/320
2. Edelbrock SC-1: 474/327
3. Edelbrock Victor: 398/294
4. TFS High Port: 390/285
There are a number of them already out there. Making these ARAO heads, that are $12,000, not to mention the supporting parts... Not as appealing as you'd think. The Brodix Neal heads are $6,000.
No question that decades of massaging have gone into the 2 valve heads, it really is amazing what can be done with 2V, but honestly, a 4V setup will always outperform a 2V setup, even with ragged ports! I just wish these ARAO guys didn't have a patent on bolt-on 4V heads. That's it, they're just bolt on. Stock pushrods fit in and manifolds bolt right up. The powerband is what's truly impressive: all else equal, the engine is making the same torque at 6000rpm, as it is at 4200rpm... with the peak occurring between 4500-5000, and with that = major HP. You also get significantly improved performance on a milder/stock cam.
Originally Posted By: mechtech2
I'd like to see the topside of those 4 valve heads.
I wonder how they are articulated?
*image courtesy of LS1LT1.com
2 valves per push rod. Cam loading not particularly affected, as the springs are much lighter because the valves are also lighter. 32 valve V8s sound just amazing!!