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I recently installed the nitrous works kit on my 86 cp. The kit says to retard the timing....It's been a while and don't remember which way to go....stock is @ 6 btc I have it at 4btc is that right???? Any help is appreciated!!!!!!
You've adjusted the timing in the correct fashion.
There are a couple other things you can do to make the kit a bit safer. Things like a window switch, fuel pressure safety switch, wide open throttle switch, swap to a cooler plug, etc...
125 is not too much for your stock engine assuming everything is in proper working condition, but that doesn't mean your invincible. A 50 shot done wrong can blow up your motor, so just do your homework and stay safe.