If you have to much timing you can have issues even if the A/F is rich....all the different factors are important when running nitrous.

1) Spark plug heat range
2) Timing
3) Octane
4) Air fuel ratio

 

Not to hijack, this thread is very helpful to beginners w/spray on LT1's. I intend to do similar on a '93. Will the MSD 6-series boxes do the job as effectively as the Mallory, or is that just preference. Thanks.

 

MSD 6's just retard the timing. No built in window switch, functions for two-step, etc. If you already have one, its cheaper to buy their window switch and wire it in with it. But if not, the Mallory is a better buy. One problem seems to be longevity with the Mallory's but I only use mine for on the spray. I use the bypass connector the rest of the time.

 

the MSD Digital 6 does include a 2 step...the only difference is the Mallory 685 has a window switch.

 

Yeah I get what you're saying now, and that sounds like a good idea to bypass it when not on the bottle, seems worth the $ to me. Appreciate the advice.