Runnin a SBC with Crane Cams Enegizer 3/4 Race Cam .5" lift intake/exhaust , 302* adv durtion, 246* at .05 and 1.5 full roller rockers I have the usual goodies like single plane intake, Dart 2.02 heads, headers/exhaust 650 D.P. and Hei dist. from accel My problem is it I can have a temp gun on my headers and they will fluctuate in temp by about 200 degrees WHILE it's runnin (at idle) in a matter of minutes with my carb having 68/72's for jets and my timing set at 36 deg. total. I recently had the carb gone through completely (acid dipped and everything in June) so i think it's aight. but i'm leaning towards the problem being my ignition. I am ALWAYS having a problem with fouling plugs at idle (i like it to idle about 500 rpms and it sounds awesome) but will foul em out. I am running accell plugs the ones for headers they're kinda shorter than usual ones(gaped at .035) With 8.8 accel plug wires,coil Is there a possibility that the plug i'm running is not in my "heat range" or that my coil isn't strong enough to fire that plug? there's got to be some reason for me to foul plugs and i'm at a loss currently. PLEASE help me.

Going up a heat range should help.

Your idle/low rpm performance may also be improved by going to a dual plane intake. This may help keep your plugs from fouling.

In the end, the solution might simply be to go with a higher idle speed.

Mike

with it idling so low you run the risk of flattening a cam lobe, the only oiling they get is by splash and at that low of a idle they're getting very little, the more lift and spring pressure the more splash needed.
what power valve is in the carb? and how much initial timimg have you set? 36 total is fine but with that much cam you need at least 16 initial.
are the front butterflies covering the idle slots in the 650? if not drill the front butterflies and get them back where they belong.

How do I go about getting a "hotter" set of plugs? What should I know about this? ANY info would be of great help and thanks for the reply's

2nd vote for the dual plane intake,,,single plane intakes are a high rpm intake,,,loping around at 500 rpm and you're asking for plugs to foul.

Has anybody heard of these plugs being known to foul quit easily? thanks

Also incase it helps when ever i try to accelerate with any suffecient amount of throttle it's backfiring through the exhaust? Would that be my timing?

Be SURE you have full battery voltage at the power terminal of the HEI.

If you have an early car that didn't come with HEI and you hook up to the original resistance wire that supplied power to the + side of the original coil, as the car runs it will lose voltage. The resistance wire is designed to supply full voltage at startup then increase resistance to cut voltage to about 10.5 after about 3 minutes. This is so the factory points won't burn.
HEI's are designed to use FULL battery voltage at all times.

Run a 12 gauge wire from a keyed terminal at the fuseblock to the HEI and see if that helps the problem.

Randy

with accell plugs the higher the part number the hotter the plug for example a 274 is hotter then a 272. I also agree with mech427 about the idle,
its cool that it will idle that low but I would bump it up at least to 800-900rpm. Also depending what coil you have you may be able to open up the plug gap to .038"-.040" But I would try the hotter plugs first

Got a set of Autolite's "26" today and put em in. Gaped at around .038. So far so good car runs ALOT better, much smoother