74droptop

What size carb to use on new motor.
It will be a 427sb with Dart 230 lenght runners,10.5 comp
cam spec's 585/600 lift 242/252 duration@50

Intake I'm not sure to use a Victor Jr. or a Super Victor

I would think at least a 850 some of the crate motor's show optional 950's but this is a street car with the occasional blast down the 1320.

Thanks.

GrandSportC3

I have a sold roller 406 small block (264/270 .050 duration and .672 lift) with Dart Pro 1 heads with 230cc intake runners and I'm using a Holley HP Series 1000 cfm mech. secondaries carb with annular boosters, part number 80514.. Works great for me.. There's no such thing as a too big carb if properly tuned!!

http://store.summitracing.com/defaul...=KeywordSearch

BTW - I'm using a Super Victor CNC (part number 2825)

Another great intake for your combo would be the Victor E intake!!

http://store.summitracing.com/partde...=KeywordSearch

StickShiftCorvette

It depends upon how high you plan to rev your engine. While a big CFM carb will always "work" your will always be able to get better throttle response with a carb sized for your engine and expected speed.

There are formulas and charts that show the best target CFM for a given displacement and top RPM. If you run a double pumper there is a Holley chart that shows at how low an RPM you can floor the accelertor without bogging for a given engine displacemnt. Obviously these are all only guidelines!

yukon988

According to Holley, an engine can pump the following amount of air (cubic feet per minute):

CID x RPM
----------
3456

So a 427 at 8000 rpm can pump:

427 x 8000
---------- = 988cfm
3456

And therefore, any carb bigger than that will not give you any benefit (according to Holley). And that assumes 100% volumetric efficiency.

comp

950

lars

But I'm gonna keep my mouth shut on this since you all know my opinion on carbs.... same as Olivier's. But I'd run an 850 on a street 427... For the street, run the Victor Junior. The Super Victor is a great piece, but it will shift your torque curve up pretty high on the rpm range.

1050 Dominator on a 406: Runs great!

After Shark

Pushing it in my opinion, but since I work for Holley My first recommendation would be our 950 4150 HP. Run it out of the box. You will be very pleased.

mandm1200

If that's the case, why don't you put 2 carbs that size on your engine?