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1983 Chevrolet Other New Chevy 350

Tiny
BENIKINS
  • MEMBER
  • 1983 CHEVROLET
  • 150,000 MILES
I put in a rebuilt Chevy 350 with dished pistons, full roller rockers and a mild cam. It was running good when I first put it in but had to rebuild the carb. It has new floats in a 650 Holley doubble pump. Just put new E3 spark plugs in and now the truck runs rough. Pulled the number one plug back out and it is a little fowled out. Sprayed it down and little black specks came out about the size of floor sweep. I don't want to run it any more if something is seriously wrong. I just can't figure it out.
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Friday, July 12th, 2013 AT 3:33 PM

6 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,640 POSTS
Was the #1 cylinder misfiring?
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Friday, July 12th, 2013 AT 7:22 PM
Tiny
BENIKINS
  • MEMBER
  • 3 POSTS
All the plugs are fowled out. I think that my fuel mixture is a little off. I am thinking of cleaning the plugs and put a vac tester on it to see if I have any leaks.
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Friday, July 12th, 2013 AT 7:49 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,640 POSTS
Are you sure the carb floats are set properly? Also, have you adjusted the air / fuel mixture?
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Friday, July 12th, 2013 AT 7:55 PM
Tiny
BENIKINS
  • MEMBER
  • 3 POSTS
I have set it back to the one and half turns for the factory reset on the carb to go from there it I can get it to idle good. I am just worried that the black particles coming out of my exhaust pipes are part of my rings. How do I know for sure.
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Friday, July 12th, 2013 AT 10:43 PM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
YOU HAVE BEEN DRIVIN' THIS PUPPY?

. OR IS IDLE CREATING THE PARTICLES?

TIMING IS RIGHT?

2ND BARREL IS CRACKED OPEN (ABOUT THE SAME AS THE PRIMARY) WHEN THE THROTTLE IS AT REST?

WHAT IS YOUR IDLE SPEED?

DID YOUR CAM INSTRUCTIONS HAVE ANY TUNING TIPS?

IT REALLY SOUNDS LIKE YOU ARE RUNNING RICH. EITHER AT IDLE (PROBABLY NOT) OR ON YOUR MAINS

YOU GOT THE FLOATS PROPERLY ADJUSTED?

FUEL PRESSURE?

WHEN SOMEONE FOLLOWS YOU DOWN THE ROAD AND YOU ARE AT A STEADY CRUISE. ANY BLACK SMOKE PRESENT?

PULL A COUPLE OF PLUGS, TAKE 'EM INTO SOME LIGHT, SEND US A PIC OF THE ELECTRODE ENDS WITH GOOD FOCUS

THE MEDIC
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Saturday, July 13th, 2013 AT 2:14 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,640 POSTS
I would think it is carbon from the engine and nothing to do with the rings.
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Saturday, July 13th, 2013 AT 8:45 PM

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