Sooty plugs - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

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post #1 of 2 (permalink) Old Jul 20th, 03, 07:07 PM Thread Starter
Senior Tech
Join Date: Sep 1999
Location: Champaign, IL, USA
Posts: 254

These plugs were pulled after only 10 miles of driving, the majority of which was spent above idle, including some WOT blasts. Motor is a 383, Dart Iron Eagle heads, Holley 780 (69 pri/76 sec), and a 472 (69 Z) intake.

The plug on the left was in the #2 hole, and the plug on the right was in the #4 hole. Both look like the motor is running too rich, but it looks like one side of the carb is richer than the other side as #2 and #4 are fed from opposite sides of the carb. The other plugs also follow the pattern.

Idle exhaust has a strong fuel smell, but does not burn my eyes. I am thinking of tightening the idle mixture that feeds #2 by an 1/8th turn and going down to 67 jets on the primary. What do you think?

Plugs are NGK UR4. I also have tried AC R45TS with similar results. Would an NGK UR45 or UR5 be a better choice?

mwh is offline  
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post #2 of 2 (permalink) Old Jul 22nd, 03, 02:16 AM
Senior Tech
Join Date: May 2000
Location: Westlake, OH 44145
Posts: 707

I would try another plug in that cyl and see if it happens again before you change any thing.

67 Blown Alcohol Camaro "The Combat Rat" 8-71 and E-85/71 BB SS Chevelle "cheap street" (clone) 12.871 @ 107.59 w/1.915 60' and spinning /2002 35th anniv SS Z28 conv./74 454 El Camino .
Milan is offline  
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