LT1 Opti spark question

[e vassar]

Originally Posted by KRatcliff

I use the MSD 83811 replacement for the GM Optispark. There is a metal wheel inside that has 360 small slots around the outside and 4 wider slots on the inside. You can use metal tape to block off all the holes except for the one that is to trigger as a cam sensor. The one hole that will be open is one of the 4 on the inside. I have to look at mine because I had a blank laser cut without any holes, but that one.

The harness is already there and it will plug into a Fast XFI system and I am sure the BigStuff would be the same. The purpose of the cam sensor for sequential is to see where the number 1 cylinder is in the firing order/stroke each time you shut off the engine. Otherwise, sequential tuning wouldn't work correctly.

On the subject of sequential tuning. How do you plan on measuring each cylinder for their respective O2 readings in order to make adjustments?

We unplugged the opti spark and are just using the crank trigger. The opti is just a cap and rotor function now.