how long how fast

I have a fx1 with a coffman pipe and a sj pump and I did the mod to the rev limiter. My ? Is how long can I just pin it without causing any problems. I'm not expecting a 23 second answer just wondering if there r any. Bad things with the mods I made thanks for the help
 
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It will run its entire life at WOT as long as the compression is not too high and the timing is not too advanced for the fuel. Stock setting are the baseline for safe pump gas operation. You can exceed pump gas octane and get away with it in short bursts.
 
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