Congrats on a fantastic run!!
Quote:
Originally Posted by b-man
Quote:
Originally Posted by Dragncar
.. why do those RAIIs run so well. They are just iron D port intake port with round port exhaust.
They seem to run as well or better than RAIVs.
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The point Dragncar was trying to make is the fact that the RAII intake port is not a raised port like on the RAIV head. It's essentially the same standard-size intake port you'll find on the common high-compression big-valve D-port 400 heads, such as the 1968 #16 head.
Most all of us are aware they're a round-port exhaust head, but again quite unique and unlike every other round-port head because of the standard-size intake port.
Huge congrats to Rick and Scott, simply an amazing accomplishment!  |
I believe it is in the intake manifold.
As I seem to recall, there was an intake manifold flow comparison done several years ago in HPP;
If I recall correctly the reduced depth in the plenum directly under the carburetor for the aluminum intake manifolds actually hurt performance on the top end - so that infact the standard cast intake manifold flowed better than the RAIV/455HO parts.
BUT!
When a carb spacer was placed between the intake and carburetor of the RAIV/455HO setup, the increased depth resulted in performance gains...
So to me, it's all in the intake, and how the two piece RAIV intake actually has the bottom of the plenum too close to the bottom of the carburetor.
The fact that Mr Mino (of RAII notoriety) has spoken up congratulating you two on a fantastic accomplishment seems to be the icing on the cake!