Correct Gap for 86 L98?
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Instructor
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From: Ol Dirty Durham NC
Correct Gap for 86 L98?
Cast Iron heads... I think I gapped incorrectly. I think they need to be .35 instead of .30. Just wanted to make sure before I spend the time to redo it. 
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Originally Posted by tsiawd1028
i heard so many oppinions any where from .030-.050 . If your normally aspirated, i think running .040.- 045 is pretty optimal on a stock ignition.
I run .045 on my 88
Intermediate
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.35 was good on my '57, ' 60. '65 and L98 with alum heads. Got a chuckle when I first looked at the manual. So, if you have iron heads, odds are .35 -- no change in over 50 years!
Modifications may call for different heat ranges. The gap is the tail end of the ignition system. It is based on what juice is being sent to the plug. No matter what theories any one has, the only way to find the right heat range is to try some hotter and colder plugs and read them. How and where you want to car to perform is also a factor.
Modifications may call for different heat ranges. The gap is the tail end of the ignition system. It is based on what juice is being sent to the plug. No matter what theories any one has, the only way to find the right heat range is to try some hotter and colder plugs and read them. How and where you want to car to perform is also a factor.
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Melting Slicks
Joined: Feb 2006
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From: backwoods upstate ny
wider gaps will reduce emissions at idle and idle will be be ''smoother''
too tight a gap may not ignite fuel mixture, but i've seen magneto systems that recommended .020''
i use .035 ''go'' and .040'' ''no-go'' for street
too tight a gap may not ignite fuel mixture, but i've seen magneto systems that recommended .020''
i use .035 ''go'' and .040'' ''no-go'' for street
