[rogoman]

The OEM spark plug gap is 0.039 - 0.043" (1 - 1.1 mm). With nitrous I would set the gap to 0.039". Nitrous has a tendency to blow out a spark if it's too wide.

I would also consider backing off the ignition timing to 15 BTDC. Always be on the lookout for detonation.

 

[rogoman]

Start at 15 to be on the safe side and see how it runs. If there's no detonation, you can try bumping the timing up 2 degrees at a time and see how it runs each time. Always be aware of any detonation; it's a killer for pistons; can make holes real fast.

 

[rogoman]

Detonation will make your motor sound like a diesel. Just make sure not to run lean on the gasoline.