Hey Matthew
Ran your numbers on my desktop. I had to assume a few things. Like duel exhaust,duel plane inlet,Are your aluminum heads rectangle or oval? With what I guessed at: You are running 492 HP at 5500 and 529 T at 3500. The dyno 2000 shows that you only gain 5 HP from a 750 to a 850.
Myself I like vacuum secondaries not a double pumper. Uses to much gas I think. If you want a closer dyno. Give me: btdc,bbdc, ivc and evc off of you cam card. Oval or rectangle ports? and your comp ratio.
Later
Jack's 66
----- Original Message -----From: Matthew PostSent: 8/9/2004 11:58:12 AMSubject: [Chevelle-list] Carb HelpHey 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
