peterbuchberg

Hi all. L48 with sportsmann 2 heads with 64cc chamber and 200 cc intake runners.
Summit 1104 cam, basic op.range 2000-5600 rpm.duration at 050 inch lift 224 intake/224exhaust. Lift 0465 int./0465 exh
Edelbrock eps intake.
Th400 with 2400 stall speed converter.

What caburator size will be the right one for this setup?

Thanks Peter

gkull

I believe carb cfm calculator programs are very close. I also believe in smaller cfm for drivablity over a small power loss at higher rpm.

It is amazing how much power race teams manage to get out motors with a two barrel carb or restricted to less than 600 cfm 4 barrel class cars make.

I always wanted to try a 650 DP on my 7500 rpm 383

SH-60B

Use a 750 Q-Jet and get the best of both worlds.

jb78L-82

Holley 650 CFM 4175 vacuum secondary Qjet replacement-easy to fine tune, easy to rebuild, mine has been ultra reliable for 25 years now. Unless you have the OEM Qjet, I would stay away from after market ones and rebuilts-they can be very problematic, if not perfect. If you do have the OEM Qjet, send it to Lars for a rebuild , if necessary.

peterbuchberg

Will the q-jet fit the edelbrock intake?

jb78L-82

I can't answer that question but forum member Karol has a 78 L-82 with the edlebrock performer 2101 and a drop base air cleaner with his stock Qjet.

johnt365

Looks like the EPS manifold is square bore. Qjet is spreadbore and may need an adapter that could raise the height beyond where you want it.

What carb do you have , what is/was on the motor when you got it?

scottyp99

A 600 cfm carb will be plenty. I recommend finding an old, rebuildable 1850, you can find them for 40-50 bucks. Run a kit through it, and enjoy.

Scott

peterbuchberg

I have an old 600 edelbrock on right now, but it's boiling and leaking fuel, so I was looking for a replacement.

scottyp99

Why not just rebuild it and use an insulator gasket?

Also, 200cc intake port heads and an EPS intake? That doesn't sound like a very good match, does it?

Scott

qwank

Unless you want to change your intake out for a spreadbore, I would toss the Edelbrock and get a new Holley

peterbuchberg

Why is that? The EPS was recommended by Edelbrock to these heads.

scottyp99

Really? Huh! I did not know that. I kinda figured a 200cc head was a little toward the high rpm end of things, as opposed to the EPS being more of a lower rpm manifold.

Scott

peterbuchberg

I can see your point,but at the same time I wanted underhood clearence, so maybee that was the best choise, I dont know.

augiedoggy

I am in the same boat only I have a new weber/carter/edelbrock afb style 600cfm (actually 625) carb on mine now and its about to be started for the first time this week. everything I,ve read including desktop dyno says a 750cfm carb will give me about 6-7 more top end hp and torque but throttle response and part throttle behavior will suffer as well as mileage..
eventually I plan on looking for something like a 670 cfm avenger which should be a good compromise.

peterbuchberg

Not many surgestion on carb size in this thread, so I think I will try a holley out too.

Manuel Azevedo

If you use a vacuum secondary carb of any brand flow rating will mean almost nothing. So they would be my first choice especially a Q jet type with the small primary and large secondary bores. The point is that the vacuum secondary's will only open as needed by the engine even if that means not opening all the way.

peterbuchberg

I know vacuum secondarys are the best choice running a automatic tranny, so a 600 or 670 street avenger I think..

MelWff

the Edelbrock site for that manifold shows up to 650 but the cam and heads seem to be at odds with the manifold

http://www.edelbrock.com/automotive/...ormer-sb.shtml

peterbuchberg

Okay. Now I know what size carb to buy but I obviously need another intake. But which or what intake will match? Anyone.