Thanks Mike. I agree. My use is the key. I think that's why I'm leaning
towards the 750. I would give up a couple extra ponies on the top end for
better street manners.
Thanks to all for your input.
At 01:00 PM 8/9/2004, you wrote:
Hey Matthew,
You have a similar engine to mine, and I started with a 850 DP, and
switched back to 770 Holley street Avenger with vaccuum adv (single
pumper). I'm much happier with the 770, but did notice a HP loss at
higher RPM.
Your question should be answered by your intended usage of the car.
Do you want/need every last bit of HP? and are you willing to
sacrifice some performance and/or fuel economy for that last bit?
My answer was 'no', and I prefer the more street friendly 770
(however, I didn't spend much time trying to improve the 850 DP).
Also, Desktop Dyno is not a fair tool to use due to it's known bug of
(more CFM = more HP). It WILL show more HP for every CFM you add.
You should see what your engine will produce with a 2500cfm carb! :-)
Good luck,
Mike
Quoting Matthew Post <[EMAIL PROTECTED]>:
> Hey Guys,
>
> I'm having my 396 rebuilt and the builder recommended a Holley double
>
> pumper, either a 750 cfm or an 850 cfm , claiming I would get a bit
> more
> top end power out of the 850.
>
> Here what I know about the engine:
> 396 being stroked out to 454
> Edelbrock Performer RPM aluminum heads (2.19/1.88)
> Edelbrock Performer RPM air-gap dual plane intake
> Crower Solid lifter cam - 294/304 duration and 536/556 lift at 110
> centerline
>
> I think the 750 will probably be a better street carb, but how much
> power
> would I sacrifice? Any thoughts out there? Anyone have desktop dyno
> that
> can run the numbers for me? That would be great! Thanks!
>
> -Matt
>
>
>
>
