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I think BeeJay's frame is notched....

GM's current Active Fuel Management technology uses a solenoid to deactivate the lifters on selected cylinders of a pushrod V-layout engine. http://en.wikipedia.org/wiki/Active_Fuel_Management

Gene, Read this http://www.thirdgen.org/techboard/dfi-ecm/476926-ls1-pcm-controlled-gen.html Rob

The 58X wheel (60-2) is not about more accuracy steady state, but rather during changes in RPM. With a 4 magnet trigger it takes 90 degrees of crank rotation before the ecu is updated with any changes in engine speed. This happens every 4 degrees with a 60 tooth wheel. The benefit is quicker...

Typically, there is not enough vacuum for power brakes. We use a vacuum pump and reservoir.

Are the ITBs connected to each other to produce a vacuum signal for a MAP sensor? If not, you will be tuning with RPM and TPS only, much more difficult. IMO, set the timing where you actually want it, say 15-18 initial, ramped up to 34 degrees all in by 2800. For fuel, Idle tuning is easy...

In not too technical terms, the wideband output is not at all linear and needs a circuit board/controller to interpret it. The confusion comes in because some ECM's have this internally and other require an external box. Rob

To answer the question I think your asking.... The new ECM's are a lot faster. Their ability to receive, process, and use data far exceeds the 80's and 90's stuff. A distributor based system would see the equivalent of four pulses per rev. A 24x wheel on the same crank would provide data six...