I just bought a 830cfm holley #9381 I would like to know if anyone has advice about adjusting it to my engine. It is a 396/325hp it has 1 3/4 headers, edelbrock dual plane manifold and midrange cam. Also will the holley bolt on to the edelbrock manifold with out a carb spacer?
Any tips would be great I am not familar with holley carbs.

is it an rpm or a performer intake? the carb seems a bit big if it's a stock motor, but it can be made to run pretty well with some fine tuning. at least it's a Holley. ;)

i think you will need the little 1/8" holley adapter plate........its a thin plate that helps to close of the open sides of the dual plane intake. most edelbrock dual plane intakes have the two sets of holes predrilled for square and speadbore carbs. you will just need the thin adapter plate.

carb should be just fine. other then that...i have ran the 850 holley on mild bbc 396 motors with out problems.........

I think a 830 cfm is too big for a street 396. A '66/67 stock 350 h.p. 396 came with 585 cfm Holley. Dave

It is a performer manifold.

I don't understand why I need the spacer and what kind of spacer do you mean.

What about changing jets or other mods to adapt it to the 396.

Thanks for your help.

It's not a spacer but rather a metal gasket that fills the intakes base when changing from the "big-rear bore" Q-Jet carb. flange to a square flange Holley, that's all.

pdq67

I think your going to loose alot of low
end with that carb, I run a 396 with 525hp
& use a Holley 750.
Larry

Well, I already bought it so I have to make it work. I don't have money to goto the dyno with 4 different carbs and see which one makes the most power. I got to make the 830 work.

ya i should have just said a plate not an adapter my bad........i have one out in the garage.........its just a thin plate you can find them in summit or jegs. your 830 holley will work just fine on the 396 even though its a double pumper.......factory jetting is 78 jets front and rear with a 6.5 power valve. you might have to do some jet changes....just keep an eye on the plugs and see how they look.
like ive said i have ran the 850 holley double pumpers on 396 motors and if i lost anything down low i dont think i missed anything cause it only ran faster at the track over the 650 and 750 holleys i had on my motors......you will be just fine.......and it will work......

you'll will find that you might have some bog spots that will have to be worked out when the secondary's come open specially at low rpms and you will have to increase the squirter shot to cover the lean spot that is created when the secondary's get flogged open.

cool, thanks for your help

CHITOWNHUSTLER:

Larry my ex-sister in law's brother Frank Hawley used to drive a funny car called Chitownhustler. Dave

The 830 annular will be just fine on a 396.
It has 2 power valves in it so keep that in mind.
That carb works real nice right out of the box as is.
Excellent carb for the $$!

I have one of these on my 350. For my motor (296º cam), I use 79/87 jets (the rear PV is blocked), 35 squirters (hollow screw in the front), and orange squirter cams. I found that, at least in my case, the carb tends to lean at higher rpm requiring bigger jets than one would expect. My carb guy backed this up saying they tend to lean from 6200 to 6700 but the mixture comes back above this. At tipoff it responds almost at well as fuel injection (a function of the annular boosters). You'll probably need to do some tuning but the carb works very well. Annular boosters magnify the vacuum signal and make up for the big venturi. Basically it is an 850 body with 750 throttles and annular boosters.