Well, if it were me, I would run a small Edelbrock AVS carb. (Secondary opening is adjusted easily). BUT....you will probably run faster at WOT with a Holley. I vote 390 then.

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225 Cubic Inches of Iron-Head American Muscle

225 bored .040 /.100 off block, Schneider Cam 224@.050~ .480 lift - Stock valves, blended bowls, Offenhauser intake with 500 Edelbrock carb

If you want to try a 390DP first, I checked with a pal to see if he had a spare. No spare, but I can rob the one off his Late Model, he hasn't raced it in over a year.

I think I have (may have sold it) a 600VS you can try, don't recall the list # but I know it's not a #1850.
If you want more, I have a #3310 (rediculus) and a #9375 (even more rediculus); or less, a #7448, #4412 and #6425 (this 2bbl will flow more than a 390DP, 475+cfm if rated like a 4bbl).

I'd go with a 650DP before I went with a 600DP.

I kinda think the 570 Street Avenger carb you have would be a good choice for a well modified street slant six. I don't know where they get 570, it has the same venturi and throttle bore as the 450 Truck Carb you have.
I know some have good luck with the 500 Edlebrock but I don't like the huge boosters, it appears to be a 600 with the flow restricting boosters giving it the 500 rating.

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Slant Cecil

Whatever the ones that are in it. I have never changed an air bleed.

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Official Cookie and Mater Tormentor.

The 390 you link to is the Nascrap 390? What about the other 390?

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'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto Dually Clubcab needs a injector pump
2005 Golden Couch Buick

What other 390DP are you talking about?

Zilla- So you have run the 390 NASCAR carb? What are your setting? Please. These carbs come with out high speed air bleeds new. The guy/girl that owned it before you must have screwed some in. What size are they?
I now own one of these carbs and things look very promising so far. I know you like to be a little secretive, but I'd like to make it to the track this Friday. I am in a bit of a hurry to get a 14 second pass time slip. I'll explain when I am aloud to do so. Don't ask, I'll tell you guys when I can. But in the mean time those setting would be very handy in getting me in the ballpark.

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir

Brenn,

In the other thread about this topic you mentioned it was a little lean on the top end. So go smaller on the air bleeds and the top end will get richer. Cut and try, cut and try.

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Joshua

Brennan,

My buddy has a 64 Valiant he just finished, with a SL6 motor very similar to yours, bored .090 over. but not stroked. 10 to 1 compression, .550 lift on the cam, Clifford set up like yours but with a smaller 2.5" tail pipe. He is using a Holley 600 double pumper and it is very smooth, no bogs it just scoots. No drone either, but a very nice sound. The track opened a couple of weeks ago and his first time slip was a 14.06. He is using a spool with 4.11 gears. Not bad for P235 14" tires. The engine is only 3 weeks old so he is still tuning. I have listened to it and watched it many times over the past 3 weeks. The 600 DP seems to very responsive for his build.

I hope all goes well with yours, just wanted to let you know that a 600DP isn't too big like some fear.

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

I would run a 600 DP rather than a 600 VS on a Slant.

My guess is that Ted's buddy's car is about 400 lbs lighter than Bren's, and a more limited purpose vehicle.

Lou

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Home of Slant6-powered fun machines since 1988

http://www.slantsix.org/forum/viewtopic.php?t=27920
Trying to combine two threads. Please post to the link above.

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir

That's exactly what it is. Edelbrock will tell you the same thing.....If I remember right, even the air bleeds are the same. You could actually change the boosters on a 500 and get a 600. Cheap, yes, but effective. I think that's why Holleys are better in race situations....they pay more attention to venturi shape, and size them accordingly.

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225 Cubic Inches of Iron-Head American Muscle

225 bored .040 /.100 off block, Schneider Cam 224@.050~ .480 lift - Stock valves, blended bowls, Offenhauser intake with 500 Edelbrock carb