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| | | | Joined: Jul 2003 Posts: 586 Shop Shark | | Shop Shark Joined: Jul 2003 Posts: 586 | I have a Holly Avenger carburator on a modified 383 chevy engine with a 700R tranny. This on my Nova, not my truck, but was hopeing someone will help anyway. The problem is when I get on it going about 30 or 40 miles per hour the engine will bog down and backfire through the carb. If I get on it gradually there is no problem and there is no problem from a dead stop. The carb is almost brand new, but I did screw around with the fuel levels and the idle adjustment. This is for a 4 barrel. Any ideas? Cecil.......... | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | Set the float level so fuel is at the bottom of the holes on the side of the bowls. Turn the idle screws in till the engine starts to slow down & turn them out about 1/2 turn. Check the timing. Try running a few degrees advanced from specs.If that doesn,t do it you may have to increase jet size or accelerator pump. 
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Jul 2003 Posts: 586 Shop Shark | | Shop Shark Joined: Jul 2003 Posts: 586 | Thanks Wrenchbender, I'll give it a try. Cecil..... | | | | | Joined: Oct 2003 Posts: 445 Shop Shark | | Shop Shark Joined: Oct 2003 Posts: 445 | try replacing the power valve.its a holley.can't ask for anything move or less
dan-pa
| | | | | Joined: Mar 2005 Posts: 8 Junior Member | | Junior Member Joined: Mar 2005 Posts: 8 | Usually backfire thru the carb is too much timing. While all of the above responses may also be true, it would seem that you have too much timing at partial load based on the description.
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