It sounds like a mechanical secondary 750 with small accelerator
pumps or some one got creative with the pump cams.
You'll save yourself a lot of guessing if you buy the Holley Carburetor book.
Possible causes: (from my old 1976 Holley book)
Power valve stuck
Accelerator pump failure
Wrong pump adjustment
From the derivability standpoint a vacuum secondary unit can't be beat
for street use.
Holley carbs are great to work with. Everything you need to know is in
the Holley book, in my opinion.
Bryan
Dick J wrote:
> When I was a kid, I put two AFBs on a stock 283 SBC and it didn't want to
>take wide open throttle really well. Now my street rod has a 468 CID big
>block with mild street cam (Comp Cam 242 flat tappet Hyd), Edelbrock Performer
>intake and 750 Holley. As far as I know (motor was built when I bought the
>car) the pistons are flat-tops, and the heads are stock from 1975.
> Cruising along at 2800 RPM, if I tromp on it, it just wants to make a lot of
>air intake noise and doesn't really respond. In fact, it almost feels like it
>accelerates faster if I back off just a little on the throttle. From a
>standing start, it's got nothing at all. Now a 750 Holley feeding 468 cubes
>is not what I'd consider "over-carbed", but it's acting just about like that
>283 did. Anybody got any ideas.
>
> DIck J
> In East Texas
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