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Mod | | | Forums66 Topics128,043 Posts1,055,540 Members48,425 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Jan 2011 Posts: 138 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2011 Posts: 138 | Hey guys,
I was test driving my neighbors 57 3100 the other day (trying to talk myself into it), and when I applied a good bit of throttle, it had one big backfire. The motor is a bored out 283 with corvette cams. but there is a exhaust leak where the manifold bolt to the actual exhaust pipe (3 bolts). the owner said the donut seal might be crooked. could this cause a backfire? he said it also might be running a little lean, but it cant be much because the idle is still a great low lope.
Alex
57' 3100 (The Bondo Bandit)
Bad rust and worse wiring, but so much fun.
| | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | It's dought ful the exhaust leak caused the backfire. It could be a lean condition or slow timing.
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: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | Or in need of a valve job... | | | | | Joined: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | Or the shooter in the carb isn't working, which of course would cause a lean condition at full throttle and have nothing to do with the idle. | | | | | Joined: Mar 2005 Posts: 637 Shop Shark | | Shop Shark Joined: Mar 2005 Posts: 637 | The accelerator pump probably is not giving a good shot of fuel. | | | | | Joined: Jan 2011 Posts: 138 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2011 Posts: 138 |
Alex
57' 3100 (The Bondo Bandit)
Bad rust and worse wiring, but so much fun.
| | | | | Joined: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | With the engine off, remove the air cleaner off and pull the throttle open. The accelerator pump should shoot a stream of gas like a water pistol. If it doesn't, you need to overhaul the carburetor. | | | | | Joined: Mar 2010 Posts: 843 Shop Shark | | Shop Shark Joined: Mar 2010 Posts: 843 | Dalyman72, if the accelerator pump is shooting a weak stream or no stream a quick fix that costs nothing is oiling the accelerator pump leather plunger to restore its elasticity.
Ray
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