Carb requirements?

How much is this going to slow me down?

383 LT1 ported heads, solid roller single plane intake.

With a 650 dp 4777 holley.

What would be the ideal carb for this? I need a 4150 base also, if I use an adapter and dominator the rear bowl will hit my cowl....so I can't do that unless I turn it sideways.

Car is gonna run like **** with that dinky little 650 on it. Have fun pulling 3" of vacuum through the lights and making pretty low power.

Turn the dominator sideways ;). Dont waste money on any of the trick deals out there, never seen em do anything but make the car nicer around the pits and at idle (big deal) assuming the out of the box carb has everything where it belongs which is iffy.

If you absolutely have to have a 4150 style carb, I would go to one of the larger race demons, always had pretty good luck there. Keep in mind the 950hp from holley is just a 750 with an 850 baseplate.

For a race car dont fool around just go straight for the dominator imo.

I hate to have a domintaor on it sideways...looks retarded:(

But I may.....holley recomends a 950hp

How big of a dominator? a 750? or get the big one?

I will never run anything from BG. seen too many problems. Either buy a holley locally from AED or get one from somebody.

If I can get something bigger by next weekend I will....but the only one I could get shorthand was this one. I'm sure I can find something bigger though

Call up BLP and ask them for a recommendation. 950hp is a joke you might as well bolt a out of the box 750 with the bleeds drilled and tapped. From what I remember you have a large cam and want to spin in the upper 7000rpm range, you really need a fairly large carb to do that and make the hp.

Another good source for carb info is Joe Sherman. He will give you the straight dope on what will run and what wont, very blunt old timer but his advice is always spot on.

Another good source for carb info is Joe Sherman. He will give you the straight dope on what will run and what wont, very blunt old timer but his advice is always spot on.

yeah I know joe, we have talked before.

Joe is probably who I would talk to he has forgot more about making a 383 run fast than most people will ever know. My experience for race carbs has been with 540+ cube engines, i'd rather just refer you than suggest something that may not be dead nuts.

If you do the sideways dominator make sure you have the correct floats in it and you run a return style regulator. If you make it thru the first 120' with a dominator you won't have issues.


I've ran a 750 dominator (which is actually a 1050 with different boosters) on a 406" and ran 9.90's with it.

The holley "ultra hp" carbs are really nice out of the box and they will perform within 98% of what a supposidly custom built carb will do. I've ran them back to back on the dyno versus many built carbs that cost up to 4 times as much.

If your looking to go custom go to Dale Cubic at CFM carbs, he is incredible and his handy work is present on the majority of the IHRA PS/nos pro-mods/top sportman cars.

I just remembered you're in virginia, if you're close to AED you might go ahead and put them at the top of your list. I know a couple of guys with thier stuff who were unable to gain any hp by making changes because they were that close out of the box.

I take good and local any day over just good.

I just remembered you're in virginia, if you're close to AED you might go ahead and put them at the top of your list. I know a couple of guys with thier stuff who were unable to gain any hp by making changes because they were that close out of the box.

I take good and local any day over just good.

AED rec a 1050 dominator, went first thing this morning. On sale too. they said should be around 650 h.p. so its borderline.

Will be running a 750 on it first.

Got the lines all run, cell and oumo etc done today. just waiting on a low profile distributor now. should be here tommorow. no regular will fit.

A nicely flowed 850 Holley DP should do just fine. I personally dont think going to the dominator will be worth all the work (cutting the cowl,or mounting sideways and changing the bowls,etc) for the power over the 850. Could be, but is the extra 10 HP worth it?

Put that 650 on ebay to get some money back for the new carb.

Put that 650 on ebay to get some money back for the new carb.

Its not mine, I borrowed it.....

everything on the car is borrowed :lol:

LOL !

I just read your other 5 page thread I didnt see before this one.

Well if its known good then run that ****. It may be down on same power but atleast you know if the problem is solved or not.

Did you get the spark prob fixed? Do you have the red and black wires for the box going directly to the battery? Thats how its supposed to be,had to re-run them on the race car.

Not trying to steel the tread completely but I got a 1050 on my 383. Hopefully I get it finished up, so I can start beating on it.

But does any one have an idea of what the companies out there do when they build a "nitrous carb". What makes it any different then a N/A carb?

Thanks

running it sat. but I think everything is fixed now....

I went with a low profile msd dist., kept the vic-E and blocked the holes, a HP carb and a 1" CV spacer....