DIY_EFI Digest V4 #606 Re: Intakes

[rpettibo at hpubs.com]

On the issue of single vs dual plane, I converted a 383 Chevy from a
Edelbrock Performer RPM (Dual Plane)  and Holley 750 (#3310) to an EFI
using a Victor JR  with sequential port injectors.  Torque increased over
50 lb/ft and HP by 30.  Both set ups were dyno tuned.  From my experience
the best air-flowing manifold is the one to go with for EFI applications.
I know the runners on the Victor flow much better than the Performer on the
flowbench.  I don't remember what the numbers were but it was significant.
The other VERY interesting thing about this conversion was an increase in
maifold vacuum.  With the carb I ran 12" at idle, which is about right with
my solid roller cam (244in, 249ex @ 050 and 555 lift).  With the fuel
injection I am at 15.8 - 16".  Anybody see this on other applications?  I
still find it hard to believe.
One thing is for sure injection is worth the price of admission.