It spikes the cylinder pretty so quick that it jars your lower end pretty good. There are people they use all the time and have no problems. It gets a bad rap because it never messes up a little bit. If it only takes out a piston/bearing/rod you are pretty lucky. I got my S14 because the previous owner had a 406 (bored out 400sbc) in it. He was turning 10.90's w/ 10in drag slicks and a non lsd rear dif. It had a wet 150 shot of nitrous til it ran lean and "scattered the motor all over the track".
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