Spark Plug Help

[norcalsvt]

Just changed my plugs a few months ago & pulled them to find they are fouled. Covered with carbon. Thought the gap was too small. I think I gapped them .44, but then thought if I am not running too rich, which if anything I am lean when I acelerate, the plugs are too cold. I used autolite 45's. What would be the next step up? I was recommended 3924's from a fellow 347 stroker, but I thought I read those are colder?

 

[2bav8]

3924s are for late model heads so they really arn't even an option.

Stock plug gap on with Autolites is .035.
Your .044 is quite a bit bigger, but could be ok with your MSD ignition.

I'd look at leaning the carb down as my first step.

 

[crushnut]

I used autolite 45's. What would be the next step up?

Autolite 46's would be the next step up, if you want a hotter plug.

 

[norcalsvt]

3924s are for late model heads so they really arn't even an option.

Stock plug gap on with Autolites is .035.
Your .044 is quite a bit bigger, but could be ok with your MSD ignition.

I'd look at leaning the carb down as my first step.

If I remember correctly, when I bought the car the plugs where 45's as well & the gap was .55. The tips were burning good. Wondering if I should bring it up to how it was when I bought it.
I'll give the mixture screws a 1/4 turn in & lower the float level to see if that helps.

 

[Ozsum2]

I'd narrow the gap down, and run a hotter plug. The rule is if you do mainly city driving then a hotter plug is recommended. For highway, a cooler one. Too cool a plug will foul out.

 

[norcalsvt]

I'd narrow the gap down, and run a hotter plug. The rule is if you do mainly city driving then a hotter plug is recommended. For highway, a cooler one. Too cool a plug will foul out.

I was thinking of giving the NGK plugs a try. WHich one would be hotte than the autolite 45? Maybe I'll try to use the plug at the stock gap of .34?
I do mostly street driving during the week. I am only 5 or so miles from work.