425 Poncho HO EFI?

[Andrew F. Gunnesch]

Possibly you mean a 400 ram air engine, or a 428 that's been upgraded
with ram air parts?  That's the only Pontiac engine that I can think it
would be...

anyways, any of the 4bbl TBI setups should work, as long as it can be
tuned for 400+ HP.  The large-cube Pontiac engines from that era put
out enormous amounts of power, (esp. low-end torque) and the potential
is there for much much more.

There is no factory FI manifold, obviously, but an enterprising
individual who runs Rance FI (at http://www.rancefi.com/ ) has converted
dual-quad manifolds for the TPI-style setup.

He also sells manifolds pre-drilled for injectors, and complete EFI
conversions.

On Feb 10,  7:41pm, Clare Snyder wrote:
> Subject: 425 Poncho HO EFI?
> A good friend of mine has 1 '69 Pontiac Gran Prix with the 425 RamAir 3
> HO engine. Currently has a Rochester quad on it, but not the right one.
> He would like to put EFI on it and, as if I didn't have enough on my
> plate, I offered to try to get some info for him. What TBI unit should
> fit this beasty? I imagine there is something that will bolt to the
> stock 4bbl manifold - an EFI manifold to fit would be asking a lot. Then
> the question is, what engine/model would use a computer that would be
> "close" to the right capacity, or has someone out there done this and
> would be willing to pass on some first hand knowledge. Prefer to stay
> with GM OEM stuff rather than some esoteric third party, high priced,
> solution.