I have victor jr intake 10-7 comp flat top piston dart head with 202 valve.boring 40 over with sat nite cam 505 to 516 lift.The rear is 411 gear an 400 tranmisson 2500 to 3500 stall.I would like to know what size carb to use.I need help please???

A 650 cfm Holley double pumper would probably do nicely.......you might could get away with the 750, but I'd try the 650 first, then go up a size if you have to.........KZ

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John D. Smith
69' SS/396
www.geocities.com/kz1000ltd (http://www.geocities.com/kz1000ltd)

Skip the 650(to small with the amount of mods you have made,it will cost you power) and go directly to a Holley in the 750 range.

Man, these are the BEST arguments.....what carb???? I'd really like to see alot of posts on this one. Just to see everyone's opinions.

I always use a much smaller carb than most folks would even think about.

With the Victor Jr., the signal to the carb is gonna be weaker than with a dual plane and the smaller venturi size will help improve velocity thru the carb. Mark my vote for 600 to 650 cfm double pumper.

I agree with mutant. I'm not saying that the 750 would be better than the 650 at low rpms as far as signal strength goes, but a 406 would need to breath as the revs climb. Just my oppinion.

your running a better combo. than i have,but i'd go for the 750vs. i have one on my 406 and notta problem yet.its a 3310-3,has a secondary metering block w/ jets,choke has been milled,and also has a 850 base plate.so it really flows "about" 830cfm; and a vs carb. is more streetable.(in my opinion.)if thats your plan,street and strip.

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My68Camaro (http://hometown.aol.com/Dougs68Camaro/index.html)
Doug G.
68 Camaro
406 ci.

I would like to know how a 850 base would work on a 750 dp carb???

I'm running a 400sb, 10-1, Edelbrock Aluminum RPM heads and intake, CC Extreme Energy cam (230/236 @ .050), MSD ignition and a manual trans. I have both the Edelbrock 600 and 750 carbs which I've switched back and forth on the motor.

The 600 makes the motor feel more responsive and it gets better gas mileage but it doesn't make the same power (seat of the pants anyway) at higher RPMs. The 750 definitely feels like it's making more power at higher RPMs but is less responsive at lower RPMs and it kills the mileage. I've jetted both of them up and down with no great changes although I'm no carb wiz so I'm sure there's more that could be done with both carbs.

Personally, I think a carb somewhere in between would be the best choice - maybe a 650 or 700?

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Scott
'69 400SB, Richmond 5-speed; '99 HD Road King Classic
www.geocities.com/sdenning1 (http://www.geocities.com/sdenning1)

You guys kill me....hehehehe! LOL. I love to watch a good argument. Please let me join the fray! CFMs depends on so many things (cubes, rpms, VE and so on) and the major one is how much RPMs are you going to turn with this monster. If you stay in 5500 range the 650 will provide superior throttle response and a crisper feel and power will not be limited. If it goes any higher the 650 will limit your high end power making ability and a 750 is more in order.

I have had cars that will pull on top end better with 750s but turn better ETs with a smaller carb just because of low end response. Not by much though. So...it's up to you!

I prefer the crisp throttle as opposed to the high end pull just because I don't use the high end that much!

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STEVE JACK
SOUTHEASTERN GOODGUYS REP

an 850 base can be modified to fit the 750.this was done by a shop,called (P&Mspeed?),here in Md. not too sure if still in business or not ,but they were in the kingsville area.they milled the top,inlarged the venturies,and changed the boosters for me.
and as for the cfm rating ...i'am going on adds i've seen with this mod.

p.s. i said VS carb.

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My68Camaro (http://hometown.aol.com/Dougs68Camaro/index.html)
Doug G.
68 Camaro
406 ci.

[This message has been edited by DOUG G (edited 10-19-2000).]

Rocky mtn racer,
Have you tried a K&N stubstack on the 650?
That might help your top end with the 650.
David

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