390 spark plug question
Senior User
Joined: Feb 2001
Posts: 158
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390 spark plug question
Are those Bosch Platinum spark plugs too hot for a 390? I can't seem to get a good color on the porcelain on my plugs, it always looks like it's running lean. I've turned the carb enrich. screws out enough to where I know it's overly rich (I can smell it in the exhaust) and still no brown on the porcelain.. Am I just being too compulsive?
More info: good vacuum, rebuilt Holley MotorCraft-style carb, good compression, timing is correct.
Greg
67 F100 CCS 390 cruise-o
More info: good vacuum, rebuilt Holley MotorCraft-style carb, good compression, timing is correct.
Greg
67 F100 CCS 390 cruise-o
Cargo Master
Joined: Jul 2000
Posts: 2,281
Likes: 18
From: Northern California
390 spark plug question
I'm no expert on this, but I did hear that you should run the standard autolite 45's and that the those others were a different temp range and wouldn't read the same. The same guy suggested that those plugs were just designed for longer runs between changes.
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