318+laughing gas

Many have done 150 ahots on cast internals without issue. As previously stated in the thread, not recommended for a tired engine. If your rings are not gapped for nitrous, i would limit the amount of nitrous. Timing is critical, start with 2 degrees retarded per 50 hp shot. Put new plugs in before the first use, do a hard pass, immediately pull Over to read the plugs. Do not use extended electrode plugs. Adjust heat range and timing as needed. Most kits are fuel rich, you may have to adjust the fuel and nitrous jets.