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Old 08-22-2010, 07:38 PM
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burnt oil

I have a 350 sbc in my 49 pickup. I replaced the manifold intake over the weekend. When I put the distributor in I must of had something set wrong.
When I went and started it up it backfired so loud it made my ears ring.
I started over and got it to start up fine. I set the timing and took it for a 50 mile cruise. When I got home I found oil all over the back of my tail gate.
It was getting dark and I looked under the truck and it looked clean. The duel tail pipes did not show any oil. I'm confused The motor only has about 100 miles since it has been re-built. I am a novice when it comes to engines. When it backfired could that of cause the damage in the engine. The engine seemed to run just fine other then a slight nock that sounds like a lifter.
Help would be appreciated.

marcus
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Old 08-22-2010, 08:28 PM
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Are you sure it is oil all over the tailgate, or could it be the condensation that forms in exhaust systems mixed with black carbon and unburnt fuel from when the engine is warming up splattered over things??

My Nova will blacken two spots on the garage door and splatter the bumper on both sides on a lot of occasions, especially after days of high humidity.

The back fire wouldn't(couldn't) have hurt anything in the engine, but a backfire can blow the powervalve in Holley carbs and cause the engine to run rich.
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Old 08-22-2010, 08:33 PM
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Quote:
Originally Posted by ericnova72
Are you sure it is oil all over the tailgate, or could it be the condensation that forms in exhaust systems mixed with black carbon and unburnt fuel from when the engine is warming up splattered over things??

My Nova will blacken two spots on the garage door and splatter the bumper on both sides on a lot of occasions, especially after days of high humidity.
most likely thats exactly what is is you may have blown a power valve on your holley carb. when it backfired.or you have a large vacuum leak. The black is unburned fuel that gets caught in the air behind your truck and sticks to your tailgate. sounds crazy but you tube a wind tunnel test on a truck the air(exhaust) just rolls around like a sideways tornado.
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Old 08-23-2010, 06:34 PM
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Got under the truck and found the oil was from my rear end. The seal next to universal joint is leaking and throwing oil up on my exhaust. Hence that is where the burnt oil is coming from. Thanks for your help.

marcus
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