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Ok, this engine is getting fuel wash I think from the dual quads not because they are to big but because my vacuume drops to 7-to 9 below 1000. So at idle it dumps to much in and causes the wash. Which makes it smoke and if I don't fix it, it will ruin the rings. So what can i do?
It is a 454, .30 with KB that have a .133 dome. I have 119cc or so 781 Oval ports ported well with 2.19, 1.88 SS valves with an Edelbrock 2X4 manifold with 2, 500cfm Edelbrock carbs Stock Jets and Rods. Comp cams Extreme Energy 274 cam. Tried upping the initial timing but gets run-on when you shut it off.

I tried a 750 Edelbrock and a Performer intake but still smoke.

Leak down shows under 5% and all compression test were with in 2 percent of each other.

So it should not be the rings. But this thing sucked down 4 quarts of oil in 900 miles driving from IL to TN for Chevelle-abration. It runs strong and after highway testing the plugs they looked good. Run around town and they are black but not wet. But if it burns that much oil how can I tell if it is fuel or oil?

I have an MSD 6AL with a Accell coil and MSD wires Hedemen Headers 1 7/8" to 2 1/2" Flowmaster exhaust.

Do I add a vacuume can? I thought they were for accessories. Vacuume pump?

Can I have the carbs modified to work well on this?

Would Swirl Torque Carb Spacers help atomize the fuel better? Page 75 in Jegs. http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=5869&prmenbr=361

Should I go to a Fast bleed lifter? or Rhodes?

Or should I take it to some place in IL or IN to have it Dyno tuned? I'm in Urbana/CHampaign IL 2 hours S. of Chicago 2 hours west of Indianapolis. 1 1/2 hours east Of Peoria.

Gotta get it fixed. Help.


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1966 Chevelle Malibu Sandalwood, Gold color
454, .30 over, dual quads
700 R4 transmission
12" disks up front and hope to have disks in the rear soon.

Q-jets have a power piston that function like the power valve in a Holley. When you install a longer duratin cam, as you know, your idle vacuum drops. In a Holley, you change to a power valve with a lower vacuum rating so that it stays closed at idle. In a Q-jet, you change the spring under the power piston. Vacuum pulls it down at idle. Since there is now less vacuum, the power piston spring may be too stiff.

I dont think fuel wash will cause oil smoke from the tail pipes. if its a black sooty smoke then its gas. otherwise oil. its not uncommon for fresh engines to consume several quarts during the first few thousand miles. I think that you may be assuming that its fuel wash. fuel wash will have a profound impact on compression. That may be where you should start. Doing a compression test.

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67 BB Prostreet Camaro
71 BB Chevelle (SS clone)
80 Camaro Z28 355 SBC
2002 35th anniv. SS Z28

The machinist has a mechanic that does installs and removals and they did compression tests all very close with in 2%. They did not hold open the carbs, said he didn't want to dump more fuel in. But they did dry and wet. It came out fine. I may take it to a 3rd party and have it assessed.

But today on my way home from there it is 45 miles away i made it 10-15 and my 4th and 3rd gears fried. Suck a#& 700 R4. Third time round with this tranny and I'm on the second one.

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1966 Chevelle Malibu Sandalwood, Gold color
454, .30 over, dual quads
700 R4 transmission
12" disks up front and hope to have disks in the rear soon.