another spark plug question - Team Camaro Tech
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post #1 of 5 (permalink) Old Jul 30th, 02, 03:19 PM Thread Starter
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Join Date: Apr 2002
Location: puntagorda fl u.s.
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sbc 400 .40 over 10.5cmp dart pro1 heads howards solid roller cam 618-620 267-273 108 center mighty demon750 dartdual koolcan 6al msd current plugs are ac delco fr2ls. after replacing the #65 power valve witha 45 (only have 5-6 in vac) and tuning all day i still have a midly rich idle an black sooty plugs if i take the curb idle any leaner it stumbles and pops. what plugs would any of you suggest, the paper work with the heads recommends champion c59yc or rc12yc. to many plugs to choose from. thanks in advance
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post #2 of 5 (permalink) Old Jul 30th, 02, 07:14 PM
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With that cam you have a lot of overlap. A mildly rich idle is the best you could hope for. The plugs will get sooty if it idles for a long period. If you're running this thing on the street take it for a long ride above 3,000 rpm's bring it back and shut it down right away and check your plugs again. If they're still really sooty try jetting down 2 sizes.

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post #3 of 5 (permalink) Old Jul 31st, 02, 12:28 AM Thread Starter
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i was thinking of dropping from 75 to 73 but was wondering if plugs were to cold. was also thinking about drilling out the air bleeds in the idle circuit. the car has awesome power when the plugs are clean.
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post #4 of 5 (permalink) Old Aug 1st, 02, 07:49 AM
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I checked the AC Delco cross reference tables and FR2LS and FR3LS are both listed as replacements for the RC12YC Champions. You might want to try the FR3LS's before you change anything else.

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post #5 of 5 (permalink) Old Aug 1st, 02, 12:54 PM Thread Starter
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i ended up crossing from the champion to a bosch 2 steps hotter. the plug has to be a .750 reach gasket. while installing these i noticed the center plugs 5-6 were fuel wet. climbing back up an checking the float sights on the mighty demon i found both the front an rear bowls nearly empty. removing the air cleaner an with a flash light i could see that the lower butterflies (no choke) were wet. a call to barry grant has a center section gsket on the way. thats all they could figure. i turned on the pump at about 5 last night an filled the bowls to find them empty again at 5 tonite. who knows $500 carb lots of problems.
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