What Carb would you get?

[dave571]

I've got the BB in the Van. YAYYYYYYYY!!!!!!!!

It runs good, idles smooth. lots of oil pressure

Problem is, it seems to not get enough fuel at wide open throttle. Twice the jam my 360 had at half throttle, but then it doesn't seem to get much better.

the engine:

1)400 cid(B engine),
2)mild port/port matched 516 casting heads(2.08int,1.60 exh)
3)9.9 comp(block decked down .085, with .039gasket, and closed heads which gives a final compression of 9.94. measured not just advertised.
4)69 383 4bbl intake
5)cast manifolds(port matched to heads)
6).490 lift cam, 272 duration, 110 centerline
7)electronic ignition(stock distributor)
8)converter is a small diameter factory stall. It seems to stall about 2200rpm(infront of a 727)
9)twin electric cooling fans
10)diff is a 3.7?:1 81/4"

The carb:

An edlebrock 4bbl. About a year old(factory reman model). Vac secondary, 600( or 650?) cfm, I can't remember. Same carb I ran I the 360.

It really likes it when you hit the gas. but the mixture leans out in the secondarys. Feels like it wants a 750 cfm double pumper.

Any recomendations? (please keep in mind , I pull a trailer with this, and don't want to install a second fuel tank on the roof)

[Ausydad]

The 600 or 650 will be too small for a BB. They work great on mild SB's, but won't feed the cubes. I believe a 750 will do fine for you. What about running one of the 800 TQ's? Should take care of the feed problem and still be plenty durable for street and towing use

[Mr.Mopar]

I was just at the track on friday night and talked a lot about this subject. Many of the guys had big problems dialing in the edelbrock carbs. Right out of the box they need lots of adjustment. A lot of the mopar guys like to run holley or TQ's. I know a guy in Edmonton that is a specialist on the TQ and am getting him to look at mine. His son runs a Duster with a 340 and a TQ and ran a 12.9 friday. Track was very slippery and slicks are a must. I run my street radials and spun the heck out of them. My 60 ft. was 2.1 at best and only 14.3 @ 97 mph. I gotta get slicks. I used my carter 630 AVS and went home and put my TQ back on. I would recommend the TQ.

[Magnum440]

Congrats on shoe-horning that monster in a van! On your carb question, I think a 750 is a bit much. The original HP 383s and 440s came with a 625 cfm Carter, I believe. TQs really go when you kick in those humongus secondarys, but they are'nt very reliable, IMO. The Demon carbs work well and you may consider a Road or Speed Demon in the 650 cfm range. I had an Edlebrock just like yours that worked well on a very mild 440. But with your cam, a 650 should be about right, IMHO.

[dave571]

I'm trying to stay away from a TQ. Mainly because I'm not keen on using an adaptor plate, and switching the intakes isn't a viable option, since I had to have the existing one machined to fit in the engine.(because of the change in deck hieght)

I know traditional thinking on double pumper carbs, is that they are too much, most of the time. Any one tried one in a similiar situation?(heavy vehicle,5000lbs, with a slightly cammed engine)??

[pishta]

You dont want a DP on a heavy vehicle. I would reduce the cross section of your jets (either slim down the rods especially the power step or fatten the jets, ) and maybe try a heavier spring set. If your motor is starving at higher RPM's is it fuel or air? Just for grins, prop the secondary air door open with a clip (dont ingest it!) then if you are still are "quitting" you factored out one variable.

[RogerH]

Do you know the part # of the current carb?

I am guessing, if you think its a 600 cfm, that its a square bore type carb.

For a 400 cid engine, you want a min of a 750 cfm carb. That would be stock to a 'performer' type setup from Edelbrock. If the engine has more power than that, like a 'performer RPM' type level then you would want a 800 cfm carb.

From Edelbrock:

pn 1407, 750 cfm with square-bore and manual choke

pn 1411, 750 cfm with square-bore and electric choke

pn 1412, 800 cfm with square-bore and manual choke

pn 1413, 800 cfm with square-bore and electric choke


I had a olds 455 engine with a 750 cfm carb, torker II, and a .500+ lift cam.

RogerH

[dave571]

Thanks for the reply Roger(and others)

I'm not sure on the part #, but I was specifically looking for 650 cfm or less, when I bought it for the 360.

Thanks for the part #'s. The 1411 sounds like the way to go. The current carb is a square bore edlebrock, with an electric choke.

I will check some local suppliers.

[RogerH]

For the 1411 they are $270 at both Jegs and Summit.

There are no cheap reman's at either site with electric choke....probably better off with a new one. Some other sites may have the reman'd with electric choke for cheaper....but I wouldn't know since I never shop for a carb =)

RogerH

[rumblefish360]

Dave;

I would use..

Edel's 750 or a Holley 700cfm. The Carb you have now is a 600. Not quite enuff with the mods you have. By the way, HP 440's came with 750 AVS's.
A vaccum secondary is needed when towing. The DP ...like said before.

[dave571]

ok.

THe carb I took off is an edelbrock 1409. On Jegs that is listed as a 600 cfm marine carb. It worked good on the 360.

I just installed the edelbrock 1411. 750cfm, vac secondary, electric choke.

The results

, as clocked by gtech pro meter. Keep in mind that g tech readings are lower even than wheel horsepower readings due to
wind friction ect.

the 360, (basically stock, with an mp intake, the 600 cfm carb, and dual exhaust) made 154hp

The 400, with the same 600cfm carb, upped the reading to 180hp.

Today, with the 750 installed, I clocked in at 212 horse power.

The more I run it, the more it seems to pull. I'm optomistic that I'll be able to tune another 10 horse power or so out of it, with timing adjustments ect.

I'm relatively pleased with the results of the whole thing. Any feedback?

[dave571]

update

224 horsepower on my last 7 11 run. Had to get a super 7(lotto) ticket. Have to go for the 34 million.

any feedback(on the power, not the lotto)

ps. I've heard that wheel power is usually 70% of flywheel. If thats so, the other numbers translate to

154=220
180=257
212=302
224=320


I was/am shooting for the 335 the old high output 383's made

[rumblefish360]

70% seems a little low. The tranny dosn't use that much power. But a long driveshaft isn't good ethier. I have seen on ....Hot Rod TV..?...they dynoed the HP useage of a Ford 9 inch rear. The unit used 5 hp. Not bad.
The numbers seam resonable. Since I'm more of a small block dude myself, thye numbers for the 360 look accurate. Or damn close. I did the same thing on my 360 Magnum. Ran real nice with bolt on's.
Your target should be had with tuneing. Take the G=tech to a stock 383 Road runner if ya can. See what you come up with. It might be intresting in what you get. I'd like to know.