[Aubrey N Bruneau]

thanks again, guys.
Dion... nobody has ever asked that ? !
Leading up to it, was so stressful, that I was actually having chest pains !
When the Edelbrock Performer put 35 HP on the stock intake ?
The stress really set it ! HOW the heck could a manifold change do more than that ?
First pull with my intake, had a "glitch" / stumble.
More stress.
Second pull... 465 torque, 462 HP
Disbelief !
Because I was still in a postion to finalize the carburetor height of the casting, we tried a couple different spacers. 1" open, then a 2" phenolic 4 hole.
1" did nothing. 2" made a few more HP, but gave up mid range torque.
Relieved
Seemed that just as cast, was best scenario ( I'm not that good.... just got lucky ! )
So, cooled the engine down a bit, and did a last pull a couple hundred RPM higher.
466.6 ft lb torque @ 4200
465.8 HP @ 5800

Still a little disbelief. Quite frankly, the A/F ratio numbers are so steady, I'm uncomfortable even posting them. Doesn't look real.

To me, I think the angle of approach to these goofy, almost horizontal intake ports in the heads, can be looked after, ONLY with a single plane manifold that accomodates them.
That, I believe, is why it worked.

Hopefully, this helps level the playing field for guys with these engines, using small port heads. A modest, hot-street build, should be able to make 500 HP. Comparable to a similar built oval port BBC. That has never been able to happen before.