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READ CAREFULLY ABOUT USING THE PORCELAIN TO READ JETTING AND READ THE LAST SENTENCE ABOUT POPPING THROUGH THE EXHAUST !!!!!!!!!!!!!!

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I actually experienced that back when I was 17.....Put a fresh motor in the car and it ran great (at least I thought it was great) on the street and at the track.....I then uncapped the exhuast and the car picked up from 13.20's @ 100 to 12.70@ 105..........after racing I capped it back up and drove home......I get almost home and decided to hammer on it and it had a slip pop out of the exhuast......it never crossed my mind that it was the plugs, so after changing valve springs and doing ALL kinds of other stuff, a friend suggested putting a fresh set of plugs in it...I told him they were new and had less than 30 miles on them.......I went ahead and did it and it fixed it!!! Freaked me out and learned a good lesson......Thing was, I knew it was rich because it'd picked up so much by uncapping the exhaust.....