NITROUS OXIDE ( nos / n2o ) advice forum

First time using spray, have a question about timing
My harley evo is a fairly healthy build , std dual plug heads
Std cases , bigbore / stroked etc, my question is for a 35 shot
Do I need to retard ignition? Iam using a dyna2000i that has a retard setting
Iam at 35 degrees total , should I retard by 4 degrees?
Still 3 feet snow on the ground so trying to get everything
Ready for spring , any help will be greatly appreciated

Very sorry for the slow response but I'm here to answer your question now.

If you had not had a twin plug head you wouldn't have needed to retard the timing at all on such a small power increase. However, although it's 'tolerable' to have 2 flame fronts collide in a NA motor, it's less than ideal to do so on a nitrous motor, so I would certainly advise you to retard the timing by at least a couple of degrees, just to be safe.